A genus of pathogenic organisms which are the most commonly reported cause of gastroenteritis in UK, although it is not known what proportion of cases are foodborne. Campylobacteriosis has been associated with the consumption of undercooked meats, milk that has been inadequately pasteurised or contaminated by birds, and contaminated water. C. jejuni (C. coli, TX 220.127.116.11) invades intestinal epithelial cells. Infectivedose 103 organisms, onset 3–8 days, duration weeks. HELICOBACTER PYLORI was formerly classified as a Campylobacter.