There has been one confirmed case of measles at Levin's Waiopehu College.

A second school in Levin has been closed due to children contracting measles, the third case of the disease in the area this week.

Levin Intermediate has joined Waiopehu College in closing after a pupil at each school was confirmed to have measles by MidCentral District Health Board on Thursday evening.

Waiopehu College parents were informed of the school's closure soon after, and Levin Intermediate posted an alert on its website on Friday morning.

Waiopehu parents have been asked to provide proof of their children's vaccinations before they can return.

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Principal Mark Robinson said a pupil was attending school for two days while at his most infectious stage, as he began showing symptoms on the weekend.

It was difficult to say how many people may have had contact with him, Robinson said.

"The student was probably in 11 classrooms over the two days."

Measles would have remained airborne for two hours after the student left each room, he said. Exposure during breaks and lunchtime would also have to be considered.

"When you start to add all that up, the potential is that's quite a lof of students."

Robinson said about 120 parents had been through the school on Friday to show their child had been vaccinated and he said the school would open on Saturday until 4pm so it could also be done then also.

He said there were one or two parents who had been in touch with the school to say their child wasn't vaccinated, which meant they would have to stay home until May 30.

"Parents who have come in today have been very understanding."

Five cases of measles were confirmed in Waikato, following a kapa haka festival in April. MidCentral DHB issued a warning soon after, following a confirmed case visiting the region.

The DHB has now confirmed the two cases were related to the current Waikato measles outbreak.

MidCentral medical officer of health Dr Rob Weir said the public health service was following up with who may have been in contact with the latest cases.

He said a third case of measles in the district had also been confirmed this week.

"Those contacts are being asked for information about their vaccination status to determine if they are at risk of developing measles themselves," Weir said.

He said the schools had approached the situation responsibly.

"We recognise there will be disruption to the school and the community, but we are doing everything possible in conjunction with the school to stop it spreading."

Levin Intermediate acting principal Robbie Edwards said there had been one confirmed case of measles at the school.

He said the school was in contact with MidCentral and Waiopehu College about the case.

"We're just discussing with the DHB and staff [about] our next steps," Edwards said.

Waiopehu College pupils and parents were asked to bring proof of two MMR vaccinations to the school during the day on Friday if they wished to return to school on Monday.

Robinson said there had been a "good rate" of parents coming to the school to prove their children's vaccinations, and expected more on Monday morning.

If parents refuse or cannot provide proof, their children cannot return until May 30.

Those students will be able to access their work as teachers organise for work to be provided online to students.

The incubation period is expected to end Friday, May 27.

All school fixtures would also need to be cancelled, but may start back up next week.

About Measles:

Measles is a highly infectious virus that spreads easily from person to person through the air, via breathing, coughing and sneezing. It affects both children and adults.

People with measles are considered infectious five days before and until five days after the rash appears.

People should stay away from work, childcare and school for five days after the appearance of rash. Non-immune contacts of a case may also be excluded.

Measles complications