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Within- and between-pen transmission of Classical Swine Fever Virus: a new method to estimate the basic reproduction ratio from transmission experiments

Published online by Cambridge University Press:  25 April 2002

D. KLINKENBERG
Affiliation:
Institute for Animal Science and Health, Quantitative Veterinary Epidemiology, P.O. Box 65, 8200 AB Lelystad, The Netherlands
J. DE BREE
Affiliation:
Institute for Animal Science and Health, Quantitative Veterinary Epidemiology, P.O. Box 65, 8200 AB Lelystad, The Netherlands
H. LAEVENS
Affiliation:
Department of Reproduction, Obstetrics and Herd Health, Veterinary Epidemiology Unit, School of Veterinary Medicine, Salisburylaan 133, B-9820 Merelbeke, Belgium
M. C. M. DE JONG
Affiliation:
Institute for Animal Science and Health, Quantitative Veterinary Epidemiology, P.O. Box 65, 8200 AB Lelystad, The Netherlands
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Abstract

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We present a method to estimate basic reproduction ratio R0 from transmission experiments. By using previously published data of experiments with Classical Swine Fever Virus more extensively, we obtained smaller confidence intervals than the martingale method used in the original papers. Moreover, our method allows simultaneous estimation of a reproduction ratio within pens R0w and a modified reproduction ratio between pens R0b. Resulting estimates of R0w and R0b for weaner pigs were 100 (95% CI 54·4–186) and 7·77 (4·68–12·9), respectively. For slaughter pigs they were 15·5 (6·20–38·7) and 3·39 (1·54–7·45), respectively. We believe, because of the smaller confidence intervals we were able to obtain, that the method presented here is better suited for use in future experiments.

Type
Research Article
Copyright
© 2002 Cambridge University Press