 During the reintroduction of corn crakes to England in the 2003 breeding season , enteritis and ill health in pre @-@ release birds was due to bacteria of a pathogenic Campylobacter species . Subsequently , microbiology tests were done to detect infected individuals and to find the source of the bacteria in their environment . 
 During the reintroduction of corn crakes to England in the 2003 breeding season , enteritis and ill health in pre @-@ release birds was due to bacteria of a pathogenic Campylobacter species . Subsequently , microbiology tests <a href='uninflect' title='1'><mark>were</mark></a> done to detect infected individuals and to find the source of the bacteria in their environment . 
Durin da reintroduction of corn crakes to England in tda2003 breeding season , enteritis and ill health in pre @-@ release birds was due to bacteria of a pathogenic Campylobacter species . Subsequently , microbiology tests was done to detect infected individuals and to find the source of the bacteria in their environment .