Abstract
Vertebrate host diversity has been postulated to mediate prevalence of zoonotic, vector-borne diseases, such that as diversity increases, transmission dampens. This “dilution effect” is thought to be caused by distribution of infective bites to incompetent reservoir hosts. We quantified avian species richness, avian seroprevalence for antibodies to West Nile virus (WNV), and infection of WNV in Culex mosquitoes, in the Chicago metropolitan area, Illinois, USA, a region of historically high WNV activity. Results indicated high overall avian seroprevalence and variation in seroprevalence across host species; however, there was no negative correlation between avian richness and Culex infection rate or between richness and infection status in individual birds. Bird species with high seroprevalence, especially northern cardinals and mourning doves, may be important sentinels for WNV in Chicago, since they were common and widespread among all study sites. Overall, our results suggest no net effect of increasing species richness to West Nile virus transmission in Chicago. Other intrinsic and extrinsic factors, such as variation in mosquito host preference, reservoir host competence, temperature, and precipitation, may be more important than host diversity for driving interannual variation in WNV transmission. These results from a fine-scale study call into question the generality of a dilution effect for WNV at coarser spatial scales.
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Acknowledgments
We thank the Village of Oak Lawn, Illinois, especially the Department of Public Works, who generously provided laboratory space during the study, as well as the municipalities who cooperated with us during field research (Alsip, City of Chicago, Evergreen Park, Harvey, Indian Head Park, Orland Park, Palos Hills). T. Thompson, G. Amore, S. Dallman, D. Gohde, M. Goshorn, J. McClain, M. Neville, B. Pultorak, and E. Secker, provided field assistance, and B. Bullard, B. Morgan, A. Thelen, M. Bender, L. Abernathy, and J. McClain assisted with processing samples in the laboratory. L. Stark and the Florida Department of Health provided positive control chicken serum, L. Mosher and the Michigan Department of Community Health provided the positive control NY99 strain of WNV, and the CDC Division of Vector Borne Infectious Diseases supplied the 4G2 and 6B6C-1 antibodies. This work was supported by the NSF/NIH program in the Ecology of Infectious Diseases (grant 04-29124). All fieldwork was carried out under appropriate collecting permits with approvals from the University of Illinois Animal Use Protocol no. 03034 and Institutional Animal Care and Use Committee at Michigan State University, Animal Use Form no. 12/03-152-00.
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Loss, S.R., Hamer, G.L., Walker, E.D. et al. Avian host community structure and prevalence of West Nile virus in Chicago, Illinois. Oecologia 159, 415–424 (2009). https://doi.org/10.1007/s00442-008-1224-6
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DOI: https://doi.org/10.1007/s00442-008-1224-6