More than two cases of gastrointestinal infection campylobacter have been reported in Northland daily since New Year's Day, prompting a call for people to practise safe hand hygiene.
Northland District Health Board medical officer of health Dr Jose Benito said 15 cases of campylobacter had been notified from Tuesday last week to yesterday but none were linked.
Of those, 12 were in Whangārei, two in Kaipara and one in the Far North.
There were seven notified cases of campylobacter over the same period last year and five for the same period in 2017.
Dr Benito said six of the 15 patients so far this year possibly got infected through recreational water contact such as at beaches and rivers, five after consuming untreated drinking water at home, three through infected animals, and one from consuming raw milk.