A fourth case of measles in Northland has health officials urging people to ensure their immunisation against the disease is up to date.
Measles is spreading around the North Island, after an outbreak in the Waikato from people attending the national kapa haka competition in Hamilton on April 16.
The first case in Northland was reported at the start of the month in Kaeo, in a person who had attended the kapa haka competition.
Northland DHB Medical Officer of Health Clair Mills said the three siblings of that first Northland case had now contracted measles and there was one case still being investigated. "And further cases are expected."
Dr Mills said the fact it was the siblings infected showed just how contagious measles is and advised Northlanders to ensure their families were protected.