Association between body size and reservoir competence of mammals bearing Borrelia burgdorferi at an endemic site in the northeastern United States

Particle and Fibre Toxicology

Klara Hanincová¹  Durland Fish¹  Jonas Bunikis²  Alan G. Barbour³ 

[1] Department of Epidemiology and Public Health, Yale School of Medicine, New Haven, CT, USA;Present Address: Department of Medicine, Vilnius University, Vilnius LT-03101, Lithuania;Departments of Microbiology & Molecular Genetics and Medicine, University of California Irvine, 3012 Hewitt, Irvine 92697-4028, CA, USA

关键词: Borrelia miyamotoi;    Lyme borreliosis;    Lyme disease;    Allometry;    Spirochete;    Peromyscus;    Ixodes;    Tickborne;   

Others  :  1224685
DOI  :  10.1186/s13071-015-0903-5

 received in 2015-03-05, accepted in 2015-05-18,  发布年份 2015

【 摘 要 】

Background

The reservoirs for the Lyme disease agent, Borrelia burgdorferi, are dominated by several different small to medium sized mammals in eastern North America.

Findings

To experimentally assess the competence of different mammalian species to transmit this pathogen to ticks, we carried out quantitative species-specific PCR of individual nymphal Ixodes scapularis ticks, which had been collected as replete larvae from animals captured at a field site in eastern Connecticut and then allowed to molt in the laboratory. The mammals, in order of increasing body mass, were the white-footed mouse, pine vole, eastern chipmunk, gray squirrel, Virginia opossum, striped skunk, and common raccoon. The prevalence of infection in the nymphs and the counts of spirochetes in infected ticks allometrically scaled with body mass with exponents of −0.28 and −0.29, respectively. By species, the captured animals from the site differed significantly in the mean counts of spirochetes in the ticks recovered from them, but these associations could not be distinguished from an effect of body size per se.

Conclusions

These empirical findings as well as inferences from modeling suggest that small mammals on the basis of their sizes are more competent as reservoirs of B. burgdorferi in this environment than medium-to large-sized mammals.

【 授权许可】

   
2015 Barbour et al.

【 图 表 】

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