The Canterbury District Health Board has received more than 110 gastroenteritis notifications from the Darfield Medical Centre.
Six of the notifications have already been confirmed as campylobacter, but it is possible other organisms will also be identified.
The gastroenteritis outbreak is likely to have been caused as a result of problems with Darfield and Selwyn Rural water supplies last week.
The Selwyn District Council has since corrected the issue with its deep underground bore system, and water supplies were declared safe to drink on August 21.
Canterbury Medical Officer of Health Dr Humphrey says gastroenteritis can easily spread from one person to another.
Dr Humphrey says people with gastroenteritis need to rest and keep well hydrated.
"It is helpful to have small sips often, every five to 10 minutes. Even if the patient is vomiting they are still likely to absorb some water. After 12-24 hours and if vomiting has stopped, patients should try eating small amounts of food."
To stop it spreading:
People should contact their General Practice team if:
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