Calculating the prevalence of mycoplasma iowae in a turkey breeding flock

Wilson, S-J., and Wood, B.J. (2009) Calculating the prevalence of mycoplasma iowae in a turkey breeding flock. In: Proceedings of the 12th Symposium of the International Society for Veterinary Epidemiology and Economics. From: International Symposia on Veterinary Epidemiology and Economics (ISVEE 12), 10-14 August 2009, Durban, South Africa.

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Mycoplasma iowae causes important production losses in turkey breeding flocks. In this study, an epidemiological approach to determining the prevalence of Mycoplasma iowae (Mi) within a turkey breeding flock has been developed. Prior prevalence of Mi in the flock was estimated from previous field samples collected during a 2006 survey, and used subsequently to determine the sample size required for estimating the flock level prevalence of Mi in the prospective survey. Other variables that were considered in the calculation of sample size included economic inputs such as labour and testing costs, inter-flock and intra-flock variances and the number of epidemiological groups on the farm. It was determined that a sampling fraction of 3.01% from all epidemiological groups would be required to detect Mi infection. The determination of the prevalence of Mi within a flock can be difficult, because transmission is erratic and it is very slow to grow in culture, sometimes taking more than 3 weeks. The recent use of a field strain validated real time PCR has improved the speed of diagnosis but it is comparatively an expensive diagnostic test when done through a commercial laboratory. Thus testing large numbers of samples is prohibitive for many companies. Using Survey Toolbox to calculate economically optimal sample sizes for estimating the prevalence of Mi, contributed to the beneficial effects of rapid diagnostic methods in flock health program focused on detection, control and elimination of disease.

Item ID: 51360
Item Type: Conference Item (Scholarly Work)
ISSN: 117-360X
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Date Deposited: 27 Oct 2017 02:53
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0702 Animal Production > 070203 Animal Management @ 100%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8399 Other Animal Production and Animal Primary Products > 839999 Animal Production and Animal Primary Products not elsewhere classified @ 100%
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