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Total 26 results found since Jan 2013.

Egg Hatching and Survival of Immature Stages of Aedes aegypti (Diptera: Culicidae) Under Natural Temperature Conditions During the Cold Season in Buenos Aires, Argentina
In temperate regions, the seasonal dynamics of Aedes aegypti (L.) (Diptera: Culicidae) is mainly influenced by temperature. It is assumed that, during the winter season, the population remains as eggs and that the development and population growth of surviving eggs begin during the following spring. The aim of the current study was to assess egg hatching of Ae. aegypti during the winter in Buenos Aires city (Argentina), and analyze the survival of immature stages. The experiments consisted of immersing eggs and studying the development of immature stages of cohorts from June and September under natural temperature conditio...
Source: Journal of Medical Entomology - January 11, 2017 Category: Biology Authors: De Majo, M. S., Montini, P., Fischer, S. Tags: Population and Community Ecology Source Type: research

Evaluation of efficacy of impregnated curtains in experimental hen houses as a phlebotomine control tool in northeast Argentina
Abstract The aim of this study was to evaluate the effectiveness of insecticide‐impregnated curtains against the entry of phlebotomine (Diptera: Psychodidae) flies into experimental slatted hen houses in an area endemic for American cutaneous leishmaniasis (ACL). Three treatments in experimental dwellings containing three chickens each were applied using, respectively, an impregnated curtain (IC), a non‐impregnated curtain (NIC) and no curtain (NC). A control site without chickens (WC) was included. The study used permethrin at 0.05 g/m2. During each month for 1 year, each experimental hen house randomly received a...
Source: Medical and Veterinary Entomology - November 30, 2016 Category: Veterinary Research Authors: M. MANTECA ACOSTA, M. S. SANTINI, A. A. P ÉREZ, O. D. SALOMÓN Tags: Original Article Source Type: research

Population dynamics of the cattle tick Rhipicephalus (Boophilus) microplus in a subtropical subhumid region of Argentina for use in the design of control strategies
Abstract The population dynamics of Rhipicephalus microplus (Ixodida: Ixodidae) in northwest Argentina was analysed to support the design of strategic methods for its control. Both parasitic and non‐parasitic phases were studied. The seasonal activity of R. microplus in its parasitic phase was characterized by three peaks in abundance: the first in mid–late spring; the second in summer, and the third in autumn. The non‐parasitic phase of R. microplus was characterized by a long total non‐parasitic period observed after exposures of females from mid‐summer to early autumn, a short total non‐parasitic period ...
Source: Medical and Veterinary Entomology - August 31, 2016 Category: Veterinary Research Authors: J. T. CANEVARI, A. J. MANGOLD, A. A. GUGLIELMONE, S. NAVA Tags: Original Article Source Type: research

Geographical Variation of Deltamethrin Susceptibility of Triatoma infestans (Hemiptera: Reduviidae) in Argentina With Emphasis on a Resistant Focus in the Gran Chaco
Chagas disease is one of the most important parasitic infections in Latin America. The main vector of the protozoan Trypanosoma cruzi in America is Triatoma infestans, a blood-sucking triatomine bug who is widely distributed in the Gran Chaco ecoregion. Control programs in endemic countries are focused in the elimination of triatomine vectors with pyrethroid insecticides. However, chemical control has failed in the Gran Chaco over the last two decades because of several factors. Previous studies have reported the evolution of different levels of resistance to deltamethrin in Tri. infestans. Recently, very high resistance h...
Source: Journal of Medical Entomology - June 29, 2016 Category: Biology Authors: Fronza, G., Toloza, A. C., Picollo, M. I., Spillmann, C., Mougabure-Cueto, G. A. Tags: Vector Control, Pest Management, Resistance, Repellents Source Type: research

Dynamics of Exposure to Rickettsia parkeri in Cattle in the Parana River Delta, Argentina
Several cases of human rickettsiosis caused by Rickettsia parkeri were recently documented in the Paraná River delta of Argentina, where the tick vector is Amblyomma triste Koch. As cattle suffer recurrent A. triste infestations, they are at risk of becoming infected with R. parkeri. Herein we investigated the dynamics of R. parkeri and its A. triste vector in a herd of beef cattle. Cattle were followed for 18 mo and samples were analyzed for the presence of antibodies against four Rickettsia species (R. parkeri, Rickettsia bellii, Rickettsia amblyommii, and Rickettsia felis) and also for the presence of rickettsial...
Source: Journal of Medical Entomology - May 19, 2016 Category: Biology Authors: Monje, L. D., Costa, F. B., Colombo, V. C., Labruna, M. B., Antoniazzi, L. R., Gamietea, I., Nava, S., Beldomenico, P. M. Tags: Vector/Pathogen/Host Interaction, Transmission Source Type: research

Host-Feeding Sources and Infection With Trypanosoma cruzi of Triatoma infestans and Triatoma eratyrusiformis (Hemiptera: Reduviidae) From the Calchaqui Valleys in Northwestern Argentina
We assessed the prevalence of infection with Trypanosoma cruzi, parasite genotypes (discrete typing units, DTUs), and the host-feeding sources of domestic and peridomestic Triatoma infestans Klug and Triatoma eratyrusiformis Del Ponte in eight rural communities of the subandean Calchaqui valleys in northwestern Argentina. We sought to analyze their epidemiological role in the context of routine vector surveillance and control actions. Infection with T. cruzi was determined by optic microscopy or polymerase chain reaction (PCR) amplification of the hypervariable region of kinetoplast DNA minicircles. Parasite genotypes were...
Source: Journal of Medical Entomology - May 19, 2016 Category: Biology Authors: Cecere, M. C., Leporace, M., Fernandez, M. P., Zarate, J. E., Moreno, C., Gürtler, R. E., Cardinal, M. V. Tags: Vector/Pathogen/Host Interaction, Transmission Source Type: research

Cold Season Mortality Under Natural Conditions and Subsequent Hatching Response of Aedes (Stegomyia) aegypti (Diptera: Culicidae) Eggs in a Subtropical City of Argentina
In this study, we analyzed the mortality of Ae. aegypti eggs exposed to the cold season as well as their hatching patterns under laboratory conditions in the city of Resistencia, Chaco, Argentina. The mortality rate was 48.6%. No statistically significant differences were observed in the mortality of eggs exposed at different sites. Hatching response differed significantly among the successive postexposure immersions, with the highest proportion of hatched eggs during the first immersion. These results show that the mortality rate of Ae. aegypti eggs exposed to the cold season in a subtropical city of Argentina was higher ...
Source: Journal of Medical Entomology - September 11, 2015 Category: Biology Authors: Gimenez, J. O., Fischer, S., Zalazar, L., Stein, M. Tags: Population and Community Ecology Source Type: research

Detection of Orthobunyavirus in mosquitoes collected in Argentina
Abstract Bunyamwera virus (BUNV) (Bunyaviridae, genus Orthobunyavirus, serogroup Bunyamwera) is considered an emerging pathogen for humans and animals in American countries. The CbaAr‐426 strain of BUNV was recovered from mosquitoes Ochlerotatus albifasciatus (Diptera: Culicidae) collected in Córdoba province (Argentina), where serological studies detected high seroprevalences in humans and animals. Molecular detection of Orthobunyavirus was performed in mosquitoes collected in Córdoba province. Seventeen mosquito pools of Oc. albifasciatus, Ochlerotatus scapularis and Culex quinquefasciatus (Diptera: Culicidae) show...
Source: Medical and Veterinary Entomology - May 20, 2015 Category: Veterinary Research Authors: L. B. TAURO, G. P. BATALLAN, M. E. RIVAROLA, A. VISINTIN, C. I. BERRÓN, E. C. SOUSA, L. A. DIAZ, W. R. ALMIRON, M. R. NUNES, M. S. CONTIGIANI Tags: Original Article Source Type: research

Ecology and genetic variation of Amblyomma tonelliae in Argentina
Abstract The ecology of Amblyomma tonelliae (Ixodida: Ixodidae), including its seasonal distribution and the development periods of each stage, was investigated during a study carried out over two consecutive years in northwestern Argentina. In addition, the genetic variation of this tick was studied through analyses of 16S rDNA sequences. Amblyomma tonelliae has a 1‐year lifecycle characterized by a long pre‐moult period in larvae with no development of morphogenetic diapause. Larvae peak in abundance during late autumn and early winter; nymphs peak in abundance in spring, and adults do so from late spring to early su...
Source: Medical and Veterinary Entomology - March 1, 2015 Category: Veterinary Research Authors: E. L. TARRAGONA, A. J. MANGOLD, M. MASTROPAOLO, A. A. GUGLIELMONE, S. NAVA Tags: Original Article Source Type: research

A new species of Tunga perforating the osteoderms of its armadillo host in Argentina and redescription of the male of Tunga terasma
Abstract A new species of Tunga (Siphonaptera: Tungidae) collected from armadillos in Argentina is described. The new species is characterized by large and pigmented eyes, the presence of two bristles on antennal segment II, two bristles at the base of the maxilla, and a discoid neosome compressed anteroposteriorly. The gravid female is located in the carapace of the host, perforating the osteoderms. The new species resembles Tunga penetrans and Tunga terasma in general appearance. However, it differs by the greater anteroposterior compression of the neosome, a more angular head, and a manubrium with a pointed proximal end...
Source: Medical and Veterinary Entomology - January 29, 2015 Category: Veterinary Research Authors: M. C. EZQUIAGA, P. M. LINARDI, D. M. DE AVELAR, M. LARESCHI Tags: Original Article Source Type: research

Fenitrothion: an alternative insecticide for the control of deltamethrin‐resistant populations of Triatoma infestans in northern Argentina
Abstract Deltamethrin‐based campaigns to control Triatoma infestans (Klug) (Hemiptera: Reduviidae) have decreased in success as a result of the development of insecticide resistance. We compared the in vitro effects of the pyrethroid deltamethrin and two doses of the organophosphate fenitrothion, presented on different materials, on T. infestans from La Esperanza, Argentina. Laboratory tests demonstrated a decrease in susceptibility to deltamethrin in the field population [LD50: 30.32 nanograms per insect (ng/i)] compared with the reference population (LD50: 0.13 ng/i), giving a high resistance ratio of 233.42. By ...
Source: Medical and Veterinary Entomology - May 17, 2013 Category: Veterinary Research Authors: M. GERMANO, M. I. PICOLLO, C. SPILLMANN, G. MOUGABURE‐CUETO Tags: Original Article Source Type: research