Outbreak of group A streptococcal pharyngitis at a national sports competition in Montevideo, Uruguay.
Authors: Gabarrot GG, Debat ET, Rodriguez G, Castro M, Gagliano G, Camou T PMID: 28343855 [PubMed - as supplied by publisher] (Source: Revista Argentina de Microbiologia)
Source: Revista Argentina de Microbiologia - March 29, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

Contribution to the knowledge of pathogenic fungi of spiders in Argentina. Southernmost record in the world.
This study constitutes the southernmost records in the world and contributes to expanding the knowledge of the biodiversity of pathogenic fungi of spiders in Argentina. PMID: 28343856 [PubMed - as supplied by publisher] (Source: Revista Argentina de Microbiologia)
Source: Revista Argentina de Microbiologia - March 29, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

Staphylococcus aureus nasal carriage in health care workers: First report from a major public hospital in Argentina.
This study is the first one of its kind in Argentina and one of the few performed in South America, to highlight the relevance of nasal carriage of MRSA and MSSA in health care personnel and brings to light the need for consensus recommendations for regular S. aureus carriage screening as well as for decolonization strategies. PMID: 28343857 [PubMed - as supplied by publisher] (Source: Revista Argentina de Microbiologia)
Source: Revista Argentina de Microbiologia - March 29, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[Inhibitory capacity of Lactobacillus spp. against pathogens involved in foodborne diseases].
Authors: Ruiz MJ, Colello R, Padola NL, Etcheverría AI Abstract The genus Lactobacillus daily generates a growing interest among microbiologists and technologists, who try to discover new biotechnological applications and probiotic properties. The main goal of this study was to evaluate the inhibitory capacity of Lactobacillus spp. against pathogens (Escherichia coli O157:H7, Salmonella spp., Staphylococcus aureus) involved in foodborne diseases. For this purpose, samples were collected at different stages of the pork production chain. Seventy eight bacterial strains were isolated. Twenty seven (27) of these...
Source: Revista Argentina de Microbiologia - March 29, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[Azospirillum brasilense Az39 labeled with GFP in Arabidopsis thaliana roots].
Authors: Díaz Herrera SM, Rossello FJ, Benavides MP, Groppa MD, Zawoznik MS PMID: 28343859 [PubMed - as supplied by publisher] (Source: Revista Argentina de Microbiologia)
Source: Revista Argentina de Microbiologia - March 29, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[Organization and preservation of the collection of pathogenic and fungal symbionts of insects and other arthropods from CEPAVE (CONICET-UNLP), La Plata, Argentina].
Authors: Gutierrez AC, Tornesello-Galván J, Manfrino RG, Hipperdinger M, Falvo M, D'Alessandro C, López Lastra CC Abstract The collection of fungal pathogens and symbionts of insects and other arthropods of the Centro de Estudios Parasitológicos y de Vectores, La Plata, Argentina, is unique because it preserves in vivo and in vitro cultures of fungal pathogens. This culture collection is open for research, teaching, consulting services, and strain deposit. It contains 421 strains belonging to 23 genera (16 Ascomycota, 4 Entomophthoromycotina, 2 Glomeromycota and 1 Oomycota), and the cultures ar...
Source: Revista Argentina de Microbiologia - March 23, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[Serological detection of Brucella suis, influenza virus and Aujeszky's disease virus in backyard and small swine holders in Argentina].
Authors: Dibarbora M, Cappuccio JA, Aznar MN, Bessone FA, Piscitelli H, Pereda AJ, Pérez DR Abstract Farmers raising less than 100 sows represent more than 99% of swine producers in Argentina, although little is known about their sanitary status and productive characteristics in the country. Sanitary and productive information was obtained. Furthermore, samples for serological studies were taken to detect antibodies against Brucella suis (Bs), Aujeszky's disease virus (AV) and influenza virus (IV) in 68 backyard and small producers with less than 100 sows located in the north, central and south regions of Ar...
Source: Revista Argentina de Microbiologia - March 23, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

Group B streptococcal necrotizing pneumonia in a diabetic adult patient.
Authors: Pacha A, Luna Cian R, Bonofiglio L, Solari M, Strada V, Suárez M, Vigliarolo L, Tersigni C, Mollerach M, Lopardo H Abstract The aim of this report is to describe a rare case of necrotizing pneumonia due to group B Streptococcus serotype III in a relatively young male adult (48 years old) suffering from diabetes. The organism was isolated from his pleural fluid and was only resistant to tetracycline. The patient first received ceftazidime (2g/8h i.v.)+clindamycin (300mg/8h) for 18 days and then he was discharged home and orally treated with amoxicillin clavulanic acid (1g/12h) for 23 days with an une...
Source: Revista Argentina de Microbiologia - March 23, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

Selected lactobacilli and bifidobacteria development in solid state fermentation using soybean paste.
Authors: Rodríguez de Olmos A, Correa Deza MA, Garro MS Abstract At present, consumers are looking for more natural foods so as to improve health through their active compounds. Within this context, soybean is an excellent substrate due to its beneficial effects on consumers' health. Moreover, lactic cultures are widely used in the food industry to improve the technological, nutritional and functional characteristics of fermented foods. It is interesting to find new matrices in which to transport these starter cultures (potentially probiotic microorganisms). The aim of this research was to obtain a solid sta...
Source: Revista Argentina de Microbiologia - March 18, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

Antagonistic activity of a Bacillus sp. strain isolated in C órdoba, Argentina against Macrophomina phaseolina (Tassi) Goid.
Antagonistic activity of a Bacillus sp. strain isolated in Córdoba, Argentina against Macrophomina phaseolina (Tassi) Goid. Rev Argent Microbiol. 2017 Mar 12;: Authors: Felipe V, Palma L, Yaryura P PMID: 28292555 [PubMed - as supplied by publisher] (Source: Revista Argentina de Microbiologia)
Source: Revista Argentina de Microbiologia - March 18, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

Fungi observation in deteriorated wooden heritage: analysis using different imaging techniques.
Authors: Alfieri PV, Correa MV PMID: 28292556 [PubMed - as supplied by publisher] (Source: Revista Argentina de Microbiologia)
Source: Revista Argentina de Microbiologia - March 18, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[Nutrient transfer and growth of Pinus greggii Engelm. inoculated with edible ectomycorrhizal mushrooms in two substrates].
Authors: Rentería-Chávez MC, Pérez-Moreno J, Cetina-Alcalá VM, Ferrera-Cerrato R, Xoconostle-Cázares B Abstract An ectomycorrhiza is a mutualistic symbiosis of paramount importance in forestry and tree production. One of the selection criteria of ectomycorrhizal fungi that has currently gained importance is their edibility due to the economic, ecological and cultural relevance of edible ectomycorrhizal mushrooms as a non-timber forest product. The effect of the inoculation with three edible ectomycorrhizal mushrooms: Laccaria laccata, Laccaria bicolor y Hebeloma leucosarx, which a...
Source: Revista Argentina de Microbiologia - March 18, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[In vitro susceptibility of Trichoconiella padwickii to various active ingredients used as fungicides in the cultivation of rice].
Authors: Lovato Echeverria AD, Gutiérrez SA, Carmona MA Abstract The aim of this study was to evaluate in vitro the mycelial susceptibility of Trichoconiella padwickii to different active ingredients through average median concentration IC50 calculation. Inoculum disks were seeded on bean agar at different concentrations (0.1; 1; 10; 30, 50; 100 and 1000mg/l) of various fungicides. After seven days the colony diameter was measured. The data obtained were fitted to nonlinear regression models. Susceptibility was classified using the scale proposed by Edgington. The results show that the pathogen is very sensi...
Source: Revista Argentina de Microbiologia - March 14, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

The relationship of Chlamydophila pneumoniae with schizophrenia: The role of brain-derived neurotrophic factor (BDNF) and neurotrophin-3 (NT-3) in this relationship.
Authors: Kalayci F, Ozdemir A, Saribas S, Yuksel P, Ergin S, Kuskucu AM, Poyraz CA, Balcioglu I, Alpay N, Kurt A, Sezgin Z, Kocak BT, Icel RS, Can G, Tokman HB, Kocazeybek B Abstract Several pathogens have been suspected of playing a role in the pathogenesis of schizophrenia. Chronic inflammation has been proposed to occur as a result of persistent infection caused by Chlamydophila pneumoniae cells that reside in brain endothelial cells for many years. It was recently hypothesized that brain-derived neurotrophic factor (BDNF) and neurotrophin-3 (NT-3) may play prominent roles in the development of schizophrenia. NT...
Source: Revista Argentina de Microbiologia - March 5, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

Insect deterrent and nematicidal screening of microfungi from Mexico and anti-aphid compounds from Gliomastix masseei.
Authors: Ruiz-Jiménez AL, González-Coloma A, Andrés-Yeves MF, Ruiz-Sánchez E, Heredia G, Peraza-Sánchez SR, Medina-Baizabal IL, Reyes-Estebanez M, Canto-Canché B, Gamboa-Angulo M Abstract Fungal metabolites are promising alternatives for the development of biorational pesticides. In this sense, microfungi from tropical regions are valuable sources of natural compounds for pest management. With the aim of broadening the search for new eco-friendly products to manage plant pests, this study was carried out to evaluate the biological activity of 23 tropical fungal extracts on ...
Source: Revista Argentina de Microbiologia - March 5, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[Isolation of Pseudomonas stutzeri from an odontogenic inflammatory cyst: Diagnostic relevance].
Authors: Molgatini S, Rey E, Basilaki J, Mosca C, Galante R, Gliosca L Abstract Pseudomonas stutzeri is distributed widely in the environment, and occupies different ecological niches. However, it is found in clinically relevant infections as an opportunistic pathogen. Isolation of P. stutzeri from an odontogenic inflammatory cyst is an uncommon microbiological finding that has not been reported to date. In the case presented here, the bacterium was isolated from surgical material obtained from excision of an inflammatory odontogenic cyst located in the tooth 1.2, and presenting with concomitant pulp necrosis. Comp...
Source: Revista Argentina de Microbiologia - February 13, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

Efficacy of epiphytic bacteria to prevent northern leaf blight caused by Exserohilum turcicum in maize.
Authors: Sartori M, Nesci A, García J, Passone MA, Montemarani A, Etcheverry M Abstract Eight potential biological control agents (BCAs) were evaluated in planta in order to assess their effectiveness in reducing disease severity of northern leaf blight caused by Exserohilum turcicum. The assay was carried out in greenhouse. Twenty-six-day-old plants, V4 phenological stage, were inoculated with antagonists by foliar spray. Only one biocontrol agent was used per treatment. Ten days after this procedure, all treatments were inoculated with E. turcicum by foliar application. Treatments performed were: C-Et: con...
Source: Revista Argentina de Microbiologia - February 13, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[MALDI-TOF mass spectrometry: Evaluation of the preanalytical phase for identification of molds].
Authors: Maldonado I, García Ramírez D, Striebeck P, Lafage M, Fernández Canigia L Abstract In order to optimize the identification of molds with MALDI-TOF MS, three protein extraction-methodologies were evaluated against 44 isolates: water extraction (WE), zirconium extraction (ZE) and the provider's recommended method (PRM). Two data bases were compared, Bruker (BK) and Bruker+National Institutes of Health. Considering both databases, results were respectively as follows: correct identification (CI) at gender level, 10 and 16 by WE; 27 and 32 by ZE and 18 and 23 by PRM; CI at species level, 5...
Source: Revista Argentina de Microbiologia - February 13, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[Blastocystis spp.: Advances, controversies and future challenges].
Authors: Del Coco VF, Molina NB, Basualdo JA, Córdoba MA Abstract Blastocystis spp. is the most common protozoan detected in human stool samples. In developing countries, infection rates are higher than 20%. The presence of this parasite in the feces of several host species suggests its zoonotic potential. The clinical relevance and the pathogenic role of Blastocystis spp. in the intestinal tract remain unclear. There are several clinical reports that recognize it as the etiologic agent of several intestinal disorders such as diarrhea, inflammatory bowel disease and ulcerative colitis, although the pathogeni...
Source: Revista Argentina de Microbiologia - February 13, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[Study of Staphylococcus aureus infections in a general acute care hospital (2002-2013)].
Authors: Togneri AM, Podestá LB, Pérez MP, Santiso GM Abstract A twelve-year retrospective review of Staphylococcus aureus infections in adult and pediatric patients (AP and PP respectively) assisted in the Hospital Interzonal General de Agudos Evita in Lanús was performed to determine the incidence, foci of infection, the source of infection and to analyze the profile of antimicrobial resistance. An amount of 2125 cases of infection in AP and 361 in PP were documented. The incidence in AP decreased significantly in the last three years (χi(2); p
Source: Revista Argentina de Microbiologia - January 28, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

Bacillus thuringiensis-based biopesticides, are they as effective as they should be?
Authors: Palma L PMID: 28108052 [PubMed - as supplied by publisher] (Source: Revista Argentina de Microbiologia)
Source: Revista Argentina de Microbiologia - January 23, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

Bioprospecting of antimicrobial activity of extracts of endophytic fungi from Bauhinia guianensis.
Authors: Pinheiro EA, Pina JR, Feitosa AO, Carvalho JM, Borges FC, Marinho PS, Marinho AM Abstract Antibiotic resistance results in higher medical costs, prolonged hospital stays and increased mortality and is rising to dangerously high levels in all parts of the world. Therefore, this study aims to search for new antimicrobial agents through bioprospecting of extracts of endophytic fungi from Bauhinia guianensis, a typical Amazonian plant used in combating infections. Seventeen (17) fungi were isolated and as result the methanolic extract of the fungus Exserohilum rostratum showed good activity against the bacteri...
Source: Revista Argentina de Microbiologia - January 18, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[Survival capacity of Corynebacterium pseudotuberculosis biovar ovis in different soil types from Chubut, Argentine Patagonia].
The objective of this work was to evaluate the survival capacity of C. pseudotuberculosis over time, in soils from the extra-Andean Patagonia region. Five types of superficial soils were collected from different areas in Chubut province (extra-Andean Patagonia), having distinctive physicochemical properties including organic matter content (very high to nonexistent), pH (neutral to strongly alkaline), electrical conductivity (saline to non-saline) and texture (sandy, clayey, silty loam). Different aliquots of each type of soil were inoculated with C. pseudotuberculosis PAT10 strain isolated from a Patagonian sheep, and wer...
Source: Revista Argentina de Microbiologia - January 10, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[Omic technologies: Current situation and future challenges].
Authors: Quiroga C PMID: 28038716 [PubMed - in process] (Source: Revista Argentina de Microbiologia)
Source: Revista Argentina de Microbiologia - January 4, 2017 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[Presence of Legionella spp. in household drinking water reservoirs in Resistencia, Chaco, Argentina. Preliminary report].
Authors: Lösch LS, Merino LA Abstract Legionella spp. is an environmental bacterium that can survive in a wide range of physicochemical conditions and may colonize distribution systems of drinking water and storage tanks. Legionella pneumophila is the major waterborne pathogen that can cause 90% of Legionnaires' disease cases. The aim of this study was to detect the presence of Legionella spp. in household drinking water tanks in the city of Resistencia, Chaco. The detection of Legionella in water samples was performed by culture methods as set out in ISO 11731:1998. Thirty two water samples were analyzed and ...
Source: Revista Argentina de Microbiologia - December 29, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

Presence of environmental coagulase-positive staphylococci, their clonal relationship, resistance factors and ability to form biofilm.
This study aimed to investigate the presence of environmental coagulase-positive staphylococci, their susceptibility profile, clonal relationship and ability to form biofilm. The 16S rRNA genes from CoPS isolates were analyzed, and their antibiotic susceptibility was evaluated using the agar dilution method in accordance with Clinical and Laboratory Standards Institute guidelines. The clonal profile was obtained by pulsed-field gel electrophoresis (PFGE) and biofilm formation was measured by a crystal violet retention assay. A total of 72 Staphylococcus spp. strains were isolated from air, metal surfaces, and nostrils from...
Source: Revista Argentina de Microbiologia - December 28, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

First survey on antibiotic resistance markers in Enterobacteriaceae in Cochabamba, Bolivia.
This study constitutes the first molecular survey on resistance markers in clinical enterobacterial isolates in Cochabamba, Bolivia, contributing to the regional knowledge of the epidemiological situation. The molecular epidemiology observed herein resembles the scene reported in South America. PMID: 27988173 [PubMed - as supplied by publisher] (Source: Revista Argentina de Microbiologia)
Source: Revista Argentina de Microbiologia - December 19, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

Microbiological quality of honey from the Pampas Region (Argentina) throughout the extraction process.
Authors: Fernández LA, Ghilardi C, Hoffmann B, Busso C, Gallez LM Abstract The microbiological quality of honey obtained from different processing points and the environmental quality within honey houses were assessed in the Pampas Region (Argentina). Mold and yeast (MY), culturable heterotrophic mesophilic bacteria (CHMB), the number of spore-forming bacteria as well as the presence of Shigella spp., Salmonella spp. and fecal coliforms were evaluated in 163 samples. These samples were taken from eight honey houses. Results showed that 89 samples had ≤10CFU of MY/g honey, 69 ranged from 10 to 50CFU/g and ...
Source: Revista Argentina de Microbiologia - December 19, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

Effect of metronidazole supplemented with hydroquinone on the adhesion of Lactobacillus acidophilus in ovine vaginal cells.
Authors: Coletti Zabala TL, Zerbatto ME, Perotti EB, Smacchia AM, Ombrella A, Pidello AR Abstract This work demonstrates that the addition of metronidazole together with a ubiquitous quinone compound reduces adherence of Lactobacillus acidophilus to ovine vaginal cells. Spectrophotometric and voltammetric studies have shown that neoformed compounds were observed in these systems; there were also changes in their electroactive composition, and the oxidant status had a significantly higher value compared to the control (p
Source: Revista Argentina de Microbiologia - December 8, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[Rapid test for detection of susceptibility to cefotaxime in Enterobacteriaceae].
Authors: Jiménez-Guerra G, Hoyos-Mallecot Y, Rodríguez-Granger J, Navarro-Marí JM, Gutiérrez-Fernández J Abstract In this work an "in house" rapid test based on the change in pH that is due to hydrolysis for detecting Enterobacteriaceae susceptible to cefotaxime is evaluated. The strains of Enterobacteriaceae from 1947 urine cultures were assessed using MicroScan panels and the "in house" test. This rapid test includes red phenol solution and cefotaxime. Using MicroScan panels, 499 Enterobacteriaceae isolates were evaluated, which included 27 isolates of Escher...
Source: Revista Argentina de Microbiologia - December 8, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[The plant growth-promoting rhizobacterium Arthrobacter agilis UMCV2 endophytically colonizes Medicago truncatula].
Authors: Aviles-Garcia ME, Flores-Cortez I, Hernández-Soberano C, Santoyo G, Valencia-Cantero E Abstract Arthrobacter agilis UMCV2 is a rhizosphere bacterium that promotes legume growth by solubilization of iron, which is supplied to the plant. A second growth promotion mechanism produces volatile compounds that stimulate iron uptake activities. Additionally, A. agilis UMCV2 is capable of inhibiting the growth of phytopathogens. A combination of quantitative polymerase chain reaction and fluorescence in situ hybridization techniques were used here to detect and quantify the presence of the bacterium in the i...
Source: Revista Argentina de Microbiologia - December 7, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

Detection of manganese peroxidase and other exoenzymes in four isolates of Geastrum (Geastrales) in pure culture.
Authors: Kuhar F, Castiglia VC, Zamora JC Abstract Knowledge regarding the enzymatic machinery of fungi is decisive to understand their ecological role. The species of the genus Geastrum are known to grow extremely slowly in pure culture, which makes it difficult to evaluate physiological parameters such as enzyme activity. Qualitative assays were performed on isolates of four species of this genus, showing evidence of laccase, cellulase, pectinase, amylase and lipase activity and suggesting that a wide range of carbon sources can be exploited by these species. For the first time in this genus, quantitative assays ...
Source: Revista Argentina de Microbiologia - December 7, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[Bacillus isolates from rhizosphere of cacti improve germination and bloom in Mammillaria spp. (Cactaceae)].
Authors: Chávez-Ambriz LA, Hernández-Morales A, Cabrera-Luna JA, Luna-Martínez L, Pacheco-Aguilar JR Abstract Cacti are the most representative vegetation of arid zones in Mexico where rainfall is scarce, evapotranspiration is high and soil fertility is low. Plants have developed physiological strategies such as the association with microorganisms in the rhizosphere zone to increase nutrient uptake. In the present work, four bacterial isolates from the rhizosphere of Mammillaria magnimamma and Coryphantha radians were obtained and named as QAP3, QAP19, QAP22 and QAP24, and were genetically iden...
Source: Revista Argentina de Microbiologia - November 25, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[Presence of Streptococcus bovis in urine samples from patients experiencing symptoms of urinary tract].
Authors: Gómez-Camarasa C, Gutiérrez Soto B, Jiménez-Guerra G, Sorlózano Puerto A, Navarro-Marí JM, Gutiérrez-Fernández J Abstract Given the relevance of proper clinical validation of Streptococcus bovis, we here consider revising its presence in urine samples in order to determine its relative frequency and the pattern of antibiotic susceptibility. The susceptibility to antibiotics of 91 isolates of S. bovis from urine samples was retrospectively reviewed over a period of 4 years (2012-2015). The mean age of patients was 55 years, 81% of whom were women and 37.4% we...
Source: Revista Argentina de Microbiologia - November 15, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

Light microscopy of microsporidian spores and baculovirus occlusion bodies in Epinotia aporema and Helicoverpa gelotopoeon larval tissues, respectively.
Authors: Arneodo JD, Taibo C, Sciocco-Cap A PMID: 27836328 [PubMed - as supplied by publisher] (Source: Revista Argentina de Microbiologia)
Source: Revista Argentina de Microbiologia - November 12, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[Pneumonia caused byCorynebacterium pseudodiphtheriticum].
We report the case of a 76 years old female patient, with a history of hypertension, hypothyroidism, type 2 diabetes and chronic renal failure, who presented pneumonia during their stay at the intensive care unit. The induced sputum revealed a representative sample with monomicrobial gram positive pleomorphic coryneform rods (Gram stain) and cultures demonstrated the presence of C. pseudodiphtheriticum as the only bacteria recovered. The pacient received an empirical third generation cephalosporin medication with a succesfull recovery. PMID: 27836329 [PubMed - as supplied by publisher] (Source: Revista Argentina de Microbiologia)
Source: Revista Argentina de Microbiologia - November 12, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

Viral diagnostic criteria for Feline immunodeficiency virus and Feline leukemia virus infections in domestic cats from Buenos Aires, Argentina.
Authors: Galdo Novo S, Bucafusco D, Diaz LM, Bratanich AC Abstract A cross-sectional study was carried out on cats attending the Small Animal Hospital at the Faculty of Veterinary Sciences of the University of Buenos Aires to assess the prevalence and associated risk factors of Feline immunodeficiency virus (FIV) and Feline leukemia virus (FeLV) in the city of Buenos Aires, Argentina. Blood samples from 255 cats with symptoms compatible with FIV or FeLV infection, collected between 2009 and 2013 were analyzed by serology (immunochromatography, IA) and by hemi-nested PCR (n-PCR). The IA and n-PCR assays showed simil...
Source: Revista Argentina de Microbiologia - November 10, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

In vitro growth and cell wall degrading enzyme production by Argentinean isolates of Macrophomina phaseolina, the causative agent of charcoal rot in corn.
This study reports for the first time the potential of different isolates of M. phaseolina to produce plant cell wall-degrading enzymes in submerged fermentation. PMID: 27825736 [PubMed - as supplied by publisher] (Source: Revista Argentina de Microbiologia)
Source: Revista Argentina de Microbiologia - November 10, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[Unusually infected sebaceous cyst by Dermabacter hominis].
Authors: Bertona E, De Paulis AN, Gutiérrez MA, Santa María V, Vay CA, Predari SC Abstract Dermabacter hominis species is constituted by Gram-positive facultative anaerobic coryneform rods being part of the resident microbiota human skin, and exceptionally associated to infections in immunocompromised or severely debilitated patients. An immunocompetent young adult woman with a neck sebaceous cyst infected by D. hominis as unique etiologic agent is presented. Phenotypic identification of the causative agent was achieved through simple tests, based on the originally scheme proposed by Funke and Bernard...
Source: Revista Argentina de Microbiologia - October 26, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

Serotypes, virulence profiles and stx subtypes of Shigatoxigenic Escherichia coli isolated from chicken derived products.
Authors: Alonso MZ, Krüger A, Sanz ME, Padola NL, Lucchesi PM Abstract Shigatoxigenic Escherichia coli (STEC) is a foodborne pathogen that causes hemolytic uremic syndrome (HUS) and the consumption of chicken products has been related to some HUS cases. We performed a non-selective isolation and characterization of STEC strains from retail chicken products. STEC isolates were characterized according to the presence of stx1, stx2, eae, saa and ehxA; stx subtypes and serotypes. Most of them carried stx2, showing subtypes associated with severe human disease. Although reported in other avian species, the stx2f su...
Source: Revista Argentina de Microbiologia - September 28, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[From stars and cold to the pandemic Influenza A (H1N1) virus: A permanent threat to humanity].
Authors: Cuestas ML PMID: 27633803 [PubMed - as supplied by publisher] (Source: Revista Argentina de Microbiologia)
Source: Revista Argentina de Microbiologia - September 20, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

Evaluation of the antimicrobial efficacy of Minthostachys verticillata essential oil and limonene against Streptococcus uberis strains isolated from bovine mastitis.
In conclusion, these compounds could be used as an alternative and/or complementary therapy for bovine mastitis caused by S. uberis. PMID: 27623108 [PubMed - as supplied by publisher] (Source: Revista Argentina de Microbiologia)
Source: Revista Argentina de Microbiologia - September 15, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

Hydrolytic enzyme activities in shiitake mushroom (Lentinula edodes) strains cultivated on coffee pulp.
Authors: Mata G, Salmones D, Pérez-Merlo R Abstract Hydrolytic enzyme production (cellulases, laminarinases and xylanases) was studied in cultures of Lentinula edodes on sterilized coffee pulp. Samples of substrate colonized by mycelia were taken after 7, 14, 21, 28 and 35 days of incubation at 25°C (W1 to W5) and during the fruiting period at different stages: formation of primordia (PF), first harvest (H) and one week after the first harvest (PH). The enzymatic activity was lower during the early mycelial growth and showed higher levels during the formation and development of fruiting bodies. During th...
Source: Revista Argentina de Microbiologia - September 13, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[Fungal biomass estimation in soils from southwestern Buenos Aires province (Argentina) using calcofluor white stain].
Authors: Vázquez MB, Amodeo MR, Bianchinotti MV Abstract Soil microorganisms are vital for ecosystem functioning because of the role they play in soil nutrient cycling. Agricultural practices and the intensification of land use have a negative effect on microbial activities and fungal biomass has been widely used as an indicator of soil health. The aim of this study was to analyze fungal biomass in soils from southwestern Buenos Aires province using direct fluorescent staining and to contribute to its use as an indicator of environmental changes in the ecosystem as well as to define its sensitivity to weathe...
Source: Revista Argentina de Microbiologia - September 13, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

Molecular detection of Sarcocystis aucheniae in the blood of llamas from Argentina.
Authors: Martin M, Decker Franco C, Romero S, Carletti T, Schnittger L, Florin-Christensen M Abstract Sarcocystis aucheniae are apicomplexan protozoa that infect South American camelids (SACs), giving rise to macroscopic cysts similar to rice grains in skeletal muscles. Visual detection of macrocysts in slaughtered animals hampers commercialization of SAC meat, a highly relevant economic exploitation for Andean rural families. Importantly, the consumption of undercooked S. aucheniae-infested meat causes gastroenteritis. A carnivore definitive host, possibly the dog, acquires the parasite when feeding on infected SA...
Source: Revista Argentina de Microbiologia - September 13, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

Assessment of the in vitro bioactive properties of lactic acid bacteria isolated from native ecological niches of Ecuador.
In this study, we evaluated the potential probiotic characteristics and antagonistic in vitro properties of some lactic acid bacteria from native niches of the subtropical rain forests of Ecuador. These isolates were identified according to their morphological properties, standard API50CH fermentation profile and RAPD-DNA polymorphism pattern. The selected isolates were further evaluated for their probiotic potential. The isolates grew at 15°C and 45°C, survived at a pH ranging from 2.5 to 4.5 in the presence of 0.3% bile (>90%) and grew under sodium chloride conditions. All selected isolates were sensitive to a...
Source: Revista Argentina de Microbiologia - September 13, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[Antibacterial and antifungal activity of Salvia apiana against clinically important microorganisms].
This study evaluated the antibacterial and anticandidal effects of a hexane extract from the root of Salvia apiana. Salvia extracts at concentrations of 27, 13.5, 6.8 and 3.4mg/ml caused growth inhibition of Staphylococcus aureus, Streptococcus pyogenes, Enterococcus faecalis and Candida albicans. However, no significant effect was observed on Escherichia coli and Candida tropicalis in comparison to vehicle. It was here demonstrated for the first time that Salvia apiana has an important antimicrobial effect on human pathogens of great clinical value, thus opening the field to continue the evaluation of this lamiaceous plan...
Source: Revista Argentina de Microbiologia - September 7, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

[Fusarium species associated with basal rot of garlic in North Central Mexico and its pathogenicity].
Authors: Delgado-Ortiz JC, Ochoa-Fuentes YM, Cerna-Chávez E, Beltrán-Beache M, Rodríguez-Guerra R, Aguirre-Uribe LA, Vázquez-Martínez O Abstract Garlic in Mexico is one of the most profitable vegetable crops, grown in almost 5,451ha; out of which more than 83% are located in Zacatecas, Guanajuato, Sonora, Puebla, Baja California and Aguascalientes. Blossom-end rot caused by Fusarium spp is widely distributed worldwide and has been a limiting factor in onion and garlic production regions, not only in Mexico but also in other countries. The presence of Fusarium oxysporum has been re...
Source: Revista Argentina de Microbiologia - September 4, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

Influence of oregano essential oil on traditional Argentinean cheese elaboration: Effect on lactic starter cultures.
Authors: Marcial GE, Gerez CL, de Kairuz MN, Araoz VC, Schuff C, de Valdez GF Abstract The aim of this work is to study the oregano essential oil (OEO) composition from Northwestern Argentinean regions and to evaluate its effect on the lactic starter cultures. The oregano used, Origanum vulgare var hirtum, was obtained from Andalgalá, Catamarca. The essential oil presented high amounts of α-terpinene (10%), γ-terpinene (15.1%), terpinen-4-ol (15.5%) and thymol (13.0%) as the main components. No negative effect on growth or metabolic activity of lactic acid bacteria Streptococcus thermophilus CRL ...
Source: Revista Argentina de Microbiologia - September 1, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research

First report of Toxocara cati in the domestic land snail Rumina decollata.
Authors: Cardillo N, Prous CG, Krivokapich S, Pittaro M, Ercole M, Perez M, Pasqualetti M, Fariña F, Rosa A, Gatti G, Ribicich M Abstract The prospective role of the land snail Rumina decollata as a potential paratenic host of Toxocara cati for domestic cats was studied. R. decollata specimens and cats' feces were collected from the open spaces of a Buenos Aires city hospital. Cats' feces were analyzed and snails were digested to identify T. cati stages, by morphological and molecular analyses. T. cati larval eggs were recovered from 23.5% (4/17) of the sampled feces. Twenty percent of snail pools (5/25) wer...
Source: Revista Argentina de Microbiologia - August 30, 2016 Category: Microbiology Tags: Rev Argent Microbiol Source Type: research