In recent years various surveys of salmonella in pigs have been undertaken. These tend to have the objective of gaining an insight into what the situation is in a certain country or region or providing follow up information for comparative purposes. These surveys are looking for statistics on salmonel-las associated with human food poisoning rather than specific diseases in pigs. For example in 2003, the Department for Environment, Food and Rural Affairs (Defra) in the UK conducted a survey of animals at slaughter in Great Britain to determine the faecal carriage of pathogens, including salmonella in pigs. This study was similar in design to a previous abattoir survey conducted in 1999-2000. In the 1999-2000 survey salmonella was isolated from 23% of caecal samples taken from slaughter pigs and from 5.3% of carcases. No improvement in levels of salmonella was found during the second survey in 2003, with 23.4% of caecal samples testing positive.
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