Frustration rises over a blow to New Zealand's supply of meningococcal B vaccines.

More than 35,000 vaccines have been affected after a cool store went outside the required temperature in the last week of February.

2,800 of those were meningococcal jabs, which are now being assessed to determine if they are still suitable to use.

Meanwhile, two 18-year-old students have been hospitalised with meningococcal in Canterbury.

Meningitis Foundation's Gerard Rushton says that he was told by Te Whatu Ora last week that vaccine supplies were good.

But he says they were astounded this week to find out both the universities and many GP practices in Canterbury were experiencing shortages.

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