Experimental infection by microparasites affects the oxidative balance in their avian reservoir host the blackbird Turdus merula

Publication date: Available online 16 February 2018 Source:Ticks and Tick-borne Diseases Author(s): Ana Cláudia Norte, David Costantini, Pedro Miguel Araújo, Marcel Eens, Jaime Albino Ramos, Dieter Heylen By draining resources, microparasites can negatively affect the host fitness, which in turn can result in reduced transmission when virulence leads to reductions in host population size. Therefore, for a microparasite to persist in nature, the level of harm it can do to its host is expected to be limited. We tested this hypothesis for tick-borne Borrelia burgdorferi sensu lato (s.l.) infections in the blackbird Turdus merula, one of the most important avian reservoir hosts in Europe. Experimental and observational data were combined to examine the physiological effects caused by B. burgdorferi s.l. infection in blackbirds. Pathogen-free blackbirds were exposed to B. burgdorferi s.l.-infected Ixodes ricinus and I. frontalis nymphs, and compared with a control group (exposed to naïve laboratory-derived I. ricinus nymphs). Their physiological status was evaluated before and after infection with B. burgdorferi s.l., through a set of immunological (erythrocyte sedimentation rate, haptoglobin, white blood cell count and heterophil/lymphocyte ratio), oxidative stress (glutathione peroxidase activity, protein carbonyls and nitric oxide) and general body condition variables (body condition, glucose and haematocrit). Infected males showed higher levels of oxidative...
Source: Ticks and Tick borne Diseases - Category: Zoology Source Type: research

Related Links:

Siba K. Samal presents a new book on Avian Virology: Current Research and Future Trends This comprehensive book provides a timely update on all of the most important avian viruses: avian influenza virus, infectious bronchitis virus, Newcastle disease virus, infectious bursal disease virus, chicken anemia virus, infectious laryngotracheitis virus, avian adenovirus, Marek's disease virus, avian reovirus, avian pox virus, avian leukosis virus, avian metapneumovirus, and avian paramyxoviruses. The chapters are written by internationally recognized experts from all over the world who have made seminal contributions to their res...
Source: Microbiology Blog: The weblog for microbiologists. - Category: Microbiology Source Type: blogs
Authors: Walker MD PMID: 30997896 [PubMed - in process]
Source: Journal of Vector Borne Diseases - Category: Infectious Diseases Tags: J Vector Borne Dis Source Type: research
Authors: Fukushima K, Yanagisawa N, Kawabata H, Yajima K PMID: 30996189 [PubMed - as supplied by publisher]
Source: Internal Medicine - Category: Internal Medicine Tags: Intern Med Source Type: research
In conclusion, our data show for the first time the presence of TBEV in ticks and the related sero-reactivity in goats, confirming the presence of TBEV in the environment of the Canton of Ticino. Further surveillance studies will have to be conducted to follow the persistence of TBEV in this region.
Source: Ticks and Tick borne Diseases - Category: Zoology Source Type: research
In this study, bird species migrating through Bulgaria were investigated as carriers of zoonotic pathogens. In total, 706 birds belonging to 46 species were checked for the presence of various bacterial pathogens (Campylobacter, Yersin ia, Salmonella, Listeria, Escherichia coli, Staphylococcus aureus, Francisella tularensis, Coxiella burnetii, Borrelia burgdorferi, and Brucella spp.). From 673 birds we investigated fecal samples, from the remaining 33, blood samples. We detected Campylobacter 16S rDNA gene in 1.3% of birds, but no ne were of pathogenic Campylobacter jejuni and Campylobacter coli species. Escherichia coli 1...
Source: Canadian Journal of Microbiology - Category: Microbiology Authors: Source Type: research
In this study, we used this chamber model and showed that I. scapularis ticks will not only acquire bovine blood but human and quail blood as well. The latter two are the incidental host and an avian host of Lyme borreliae, respectively. We also investigated the roles that BBA52 and Lp6.6 play in promoting spirochete survival in nymphal ticks fed on human or quail blood. After feeding on human blood, spirochete burdens in ticks infected with an lp6.6-deficient B. burgdorferi were significantly reduced, while bba52-deficient spirochete burdens in ticks remained unchanged, similar to the wild-type strain. No strain showed a ...
Source: Ticks and Tick borne Diseases - Category: Zoology Source Type: research
CONCLUSIONS: The obtained results show that the pheasants had developed antibodies to the investigated tick-borne agents. For this reason, they seem to be involved in the epidemiology of the studied tick-borne bacteria. PMID: 28378988 [PubMed - in process]
Source: Annals of Agricultural and Environmental Medicine : AAEM - Category: Environmental Health Authors: Tags: Ann Agric Environ Med Source Type: research
Mepron, a thick liquid antimicrobial drug used to treat Babesia and malaria, as well as a fungal infection called Pneumocystitis carinii. In 2011, the United Kingdom stopped requiring that dogs brought into the country be inspected for ticks. Earlier this year, several dogs tested positive for babesia, a malaria-like disease transmitted to ticks that previously had only been found in foreign. These dogs had never left the U.K. While babesiosis is a new worry to U.K. dog owners, it's been a threat to human beings for years -- it just hasn't become a health-scare-of-the-week like Zika, West Nile, avian and swine flu. Most...
Source: Healthy Living - The Huffington Post - Category: Consumer Health News Source Type: news
Conclusion: Our study suggests that the tick, and not the pathogen, controls the early stages of host choice behaviour.
Source: Parasites and Vectors - Category: Microbiology Authors: Source Type: research
More News: Allergy & Immunology | Bird Flu | Borrelia | Laboratory Medicine | Lyme Disease | Nutrition | Study | Tickborne Diseases | Zoology