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Journal of Clinical Microbiology, October 2007, p. 3239-3244, Vol. 45, No. 10
0095-1137/07/$08.00+0 doi:10.1128/JCM.01226-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Departments of Veterinary Pathology,1 Veterinary Clinical Sciences, University of Liverpool, Leahurst, Neston, Wirral CH64 7TE, United Kingdom,2 Cambridgeshire and Peterborough Public Health Network, Kingfisher House, Cambridgeshire, Huntingdon PE29 6FH, United Kingdom,3 Epidemiology Section, Animal Health Trust, Suffolk, Newmarket CB8 7UU, United Kingdom,4 Department of Veterinary Medicine, University of Cambridge, Madingley Road, Cambridge CB3 0ES, United Kingdom5
Received 18 June 2007/ Returned for modification 24 July 2007/ Accepted 31 July 2007
The control of outbreaks of calicivirus infection in high-density, high-throughput populations is a challenge to both human and veterinary medicine. In such populations, the prevalence of infection is, in part, dependent on the levels of biosecurity and how this affects virus transmission. Here we show how longitudinal analysis of feline calicivirus (FCV) infection in an animal rescue shelter can be used as a model to examine the dynamics of calicivirus transmission and evolution in such environments. FCV was isolated from 33 of 116 cats sampled over a 15-month period (overall prevalence, 28%). Sequence analysis of the immunodominant variable regions of the viral capsid gene identified 16 strains circulating in the shelter, with no single strain appearing to predominate. The majority of these strains were introduced into the shelter from the community and did not appear to be transmitted within the population. However, for three of these strains, putative transmission events within the shelter were identified. The rates of evolution within hypervariable regions of the FCV capsid gene in individual cats ranged from 0.05 to 1.4% per week, with the highest rates generally being found in animals that either acquired the virus while in the shelter or were undergoing acute infection. These data suggest that despite the high prevalence and presence of multiple strains of FCV within the shelter, the spread of such pathogens may be restricted by various control measures, including good hygiene and biosecurity.
Published ahead of print on 8 August 2007.
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