Samples from the antrum and fundus of the stomachs of 457 pigs from 22 different herds were screened for the presence of ‘Candidatus Helicobacter suis’ by pcr, and samples from the antrum and/or fundus of 222 of the stomachs were tested for urease activity. The prevalence of the infection was very low before weaning, increased rapidly after weaning and reached 90 per cent in the adult boars and sows. The agreement between the results obtained with the pcr test and the urease test was very good for some age groups and sampling sites, but poor for other age groups and sampling sites.
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