The trend patterns for the proportion of cases of lung abscess differed for the three schemes; a decline in the prevalence over the years for England&Wales, an increasing trend in Scotland since 2009, and a decreasing trend in Northern Ireland since 2008 after an initial increase between 2005 and 2008.
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Comparison of Respiratory Disease Prevalence among Voluntary Monitoring Systems for Pig Health and Welfare in the UK.
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