Vaccination rates are dropping across the country as fewer families immunise their babies.

Now, in the midst of a measles epidemic, a Herald analysis of immunisation data finds just 77 per cent of 6-month-olds are now getting their vaccines on time.

While the debate has been centred around the impact of the anti-vaxx movement, the numbers paint a different picture.

Kirsty Johnston and Chris Knox report.

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Plummeting vaccination rates are being driven largely by the failure to immunise babies born into poor or Māori families - not by parents deliberately opting out.

A Herald analysis of immunisation data from every

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DHB Vaccination Rates