Sampling Considerations in Surveys and Monitoring and Surveillance Systems

Cameron, Angus; Gardner, Ian A.; Doherr, Marcus G.; Wagner, Brian J.

doi:10.1002/9780470344866.ch4

Cited by 13 publications

(15 citation statements)

References 2 publications

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“…The cornerstone of risk-based sampling strategies is stratification of the target population into categories that display heterogeneity in probability of harbouring a hazard, or heterogeneity in the severity of consequence if the hazard is present. The probability of individual units within strata to be sampled can nevertheless be calculated, which makes this type of sampling a special case of probability sampling and different from non-probability or purposive sampling as described by Cameron et al (2003). Strata to be used for risk-based sampling are derived from epidemiological studies assessing the probability of occurrence of the hazard in the stratum (e.g.…”

Section: Risk-based Selection Of Population Stratamentioning

confidence: 99%

Concepts for risk-based surveillance in the field of veterinary medicine and veterinary public health: Review of current approaches

Stärk

Regula

Hernández

et al. 2006

BMC Health Serv Res

258

171

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Background: Emerging animal and zoonotic diseases and increasing international trade have resulted in an increased demand for veterinary surveillance systems. However, human and financial resources available to support government veterinary services are becoming more and more limited in many countries world-wide. Intuitively, issues that present higher risks merit higher priority for surveillance resources as investments will yield higher benefit-cost ratios. The rapid rate of acceptance of this core concept of risk-based surveillance has outpaced the development of its theoretical and practical bases.

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Section: Risk-based Selection Of Population Stratamentioning

confidence: 99%

Concepts for risk-based surveillance in the field of veterinary medicine and veterinary public health: Review of current approaches

Stärk

Regula

Hernández

et al. 2006

BMC Health Serv Res

258

171

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“…The basic elements for estimating sample size are the confidence level to be used, the Se and Sp of the diagnostic test, the establishment of a minimum prevalence detected and the probability of erroneously concluding the presence of the disease when it is not found (Thrusfield ; Cameron et al . ; Dohoo et al . ).…”

Section: Number Of Feral Fish Sampled By Lake and Species Los Lagos mentioning

confidence: 96%

“…In the lakes where the sample size was fulfilled, it can be stated with 95% confidence level that salmon pancreas disease virus (SPDV/SAV), if it is present, would be at a prevalence lower than 1%; that is, it is likely that the agent is not present in the population of feral salmonids from those lakes (Cameron et al . ). In the case of the wild fish species, at least it can be stated that the sampled individuals were free of the PD agent in all tested lakes.…”

Section: Number Of Feral Fish Sampled By Lake and Species Los Lagos mentioning

confidence: 97%

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Cross‐sectional study to investigate the presence of salmon pancreas disease virus in wild and feral fish populations in 10 lakes, Los Lagos Region, Chile

Alegría

Arriagada

Urcelay

et al. 2014

Journal of Fish Diseases

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“…Using clean gloves for each pen, samples were collected from five different places within a pen for a total of about 200 g faeces. The sampled pens were purposively selected [18] from a room containing pigs closest to market weight. Modifications to this protocol were made on farms that had fewer than five pens per room.…”

Section: Pen Selectionmentioning

confidence: 99%

Multilevel analysis of risk factors for Salmonella shedding in Ontario finishing pigs

et al. 2007

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The objectives of this study were to identify factors associated with Salmonella status at the farm, pen, and pig level; explore the nature of variation in the association between the pen-level Salmonella status and pen-level covariates, and pig-level Salmonella status and pig- and pen-level covariates; and to identify the relative importance of factors operating at geographical, farm, and pen level for Salmonella shedding of pigs. For these purposes, samples from 799 pigs and 374 pens on 80 farms in Ontario in 2004 were collected and bacteriologically tested in a cross-sectional study. Census division was the least variable level, and farm the most variable level for shedding. Increased frequency of disinfection and washing with cold water were positively associated with Salmonella positivity, whereas liquid and mash feed and completely closed barns were sparing factors. After farm, pen was the second most variable level for shedding. However, no measured pen-level variables were associated with Salmonella status of pigs or pens. The shedding of Salmonella at the pig level tended to be associated with pig weight, and there was no random variation around this association. Results of this study suggest that a herd test based on bacteriological culture would probably have higher sensitivity if growing animals of lower weight were sampled instead of market weight animals, and this might be beneficial for Salmonella monitoring.

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Sampling Considerations in Surveys and Monitoring and Surveillance Systems

Cited by 13 publications

References 2 publications

Concepts for risk-based surveillance in the field of veterinary medicine and veterinary public health: Review of current approaches

Concepts for risk-based surveillance in the field of veterinary medicine and veterinary public health: Review of current approaches

Cross‐sectional study to investigate the presence of salmon pancreas disease virus in wild and feral fish populations in 10 lakes, Los Lagos Region, Chile

Multilevel analysis of risk factors for Salmonella shedding in Ontario finishing pigs

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