Risk-based design of repeated surveys for the documentation of freedom from non-highly contagious diseases

Hadorn, D.; Rüfenacht, J.; Hauser, R.; Stärk, Katharina D.C.

doi:10.1016/s0167-5877(02)00193-9

Cited by 31 publications

(19 citation statements)

References 11 publications

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“…The 95% level of confidence, the minimum expected prevalence of the disease within a farm and 20% amongst farms were assumed to be 10% based on the knowledge of the biology of the disease and the nature of the screening test (Cameron and Baldock, 1998;Hadorn et al, 2002). The nature of the surveillance method took into consideration that at present no evidence of the disease and if the disease is present, likely to be in the small proportion of the farms (Cameron and Baldock, 1998;Hadorn et al, 2002).…”

Section: Resultsmentioning

confidence: 99%

“…The nature of the surveillance method took into consideration that at present no evidence of the disease and if the disease is present, likely to be in the small proportion of the farms (Cameron and Baldock, 1998;Hadorn et al, 2002).…”

Section: Resultsmentioning

confidence: 99%

“…The necessary sample size for this survey was calculated for a random sampling protocol in a risk-based approach as suggested by Hadorn et al (2002). Since it is a large -area survey and national wide sampling, we adopted the two-stage random sampling method as recommended by Cameron and Baldock (1998).…”

Section: Sampling Design and Sampling Framementioning

confidence: 99%

“…The first stage of sampling involved a random selection of three farms in different geographical locations along the coastal states of Gujarat, Maharashtra, Goa, Kerala, Tamil Nadu, Andhra Pradesh, Odisha and West Bengal in India, where intensive shrimp farming prevailed (Cameron and Baldock, 1998;Cameron, 2002;Hadorn et al, 2002). A list of 60 active shrimp farming areas was first generated and from that, a total of 21 farms/hatcheries were randomly selected using the Epi Tool Free Calc software.…”

Section: Sampling Design and Sampling Framementioning

confidence: 99%

“…In this context, the present study was conducted to determine the status of IMNV in Indian shrimp aquaculture by adopting risk-based two stage random sampling targeted survey with imperfect tests. The risk-based two stage random sampling survey was adopted hypothesising that the disease is present at a level equal to or greater than the minimum expected prevalence (Hadorn et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

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Surveillance for infectious myonecrosis virus in Indian shrimp aquaculture

et al. 2017

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Disease surveillance programmes provide information on diseases that mitigate aquaculture production. Infectious myonecrosis virus (IMNV) has emerged recently as one of the OIE (Office International des Epizooties, the World Organisation for Animal Health) listed viral diseases in penaeid shrimps, caused by dsRNA virus. The present study was conducted to investigate the prevalence of IMNV along the Indian coastal states. Samples of the Pacific whiteleg shrimp Penaeus vannamei and the green tiger shrimp Penaeus monodon were collected from 21 randomly selected active shrimp farms located along the coast using a risk-based two stage random sampling survey. Screening of the sampled shrimps based on nested RT-PCR diagnostic tool, did not detect IMNV in any of the samples examined indicating absence of IMN or IMNV incidence in shrimp aquaculture along Indian coastal states.

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