Omeprazole as a risk factor for campylobacter gastroenteritis: case-control study

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Abstract
Between January 1992 and August 1994, 243 notified cases of campylobacter infection, confirmed by faecal culture, were identified in people aged 45 and over in two of the local district councils within Nottingham Health Authority. Thirty two cases were excluded (non-resident (four), general practitioner declined (19), patient died and notes unobtainable (six), and notes unobtainable at general practice (three)), leaving 211 (123 women). The minimum age was 45 because people over this age have higher rates of prescribing by general practitioners. Controls were identified as the next two patients matched for sex and age within two years in the practice computerised records. No controls were excluded.