Dozens of dehydrated children are needing hospital treatment as a result of hand, foot and mouth disease.
Auckland Starship Hospital's emergency department has been treating up to 15 children, aged between 2 and 5, each week for almost a month.
Hand, foot and mouth is a contagious virus based in the intestine. It is not the same as the veterinary disease, foot and mouth.
Starship's director of child health Dr Richard Aickin said: "You go through long periods of time where you see very few and you get outbreaks from time to time, and we are in the middle of one of those outbreaks." Children affected often broke out in red blisters on the soles of feet, their hands, and in and around the mouth.
It was not considered serious but many children became dehydrated because the blisters made it painful to drink water, he said. "It is an infection most children have as they are growing up."