Criteria | Cases | Controls |
Had diarrhoea (≥3 loose bowel movements in 24 hours) | Include | Exclude |
Known date of illness onset | Include | NA |
Household members positive for Campylobacter in 4 weeks prior to onset of illness | Exclude | Exclude (4 weeks prior to interview date) |
Household members experiencing diarrhoea in 4 weeks prior to onset of illness | Exclude | Exclude (4 weeks prior to interview date) |
Travelled outside of Australia in 2 weeks prior to onset of illness | Exclude | Exclude (2 weeks prior to interview date) |
Travelled interstate for the entire 2 weeks prior to onset of illness | Exclude | Exclude (2 weeks prior to interview date) |
Cannot speak English | Exclude | Exclude |
Not able to answer questions for some other reason (eg, intellectually disabled) | Exclude | Exclude |
Not contactable after six telephone attempts | Exclude | Exclude |
Live outside the catchment areas | Exclude | Exclude |
Do not have a telephone number available for their primary residence, or a mobile phone | Exclude | Exclude |
An enteric pathogen other than Campylobacter was isolated/detected in their stool (excluding Blastocystis hominis and Dientamoeba fragilis) | Exclude | NA |
NA, not applicable.