Many outreach services, which offered vaccination in homes, were unable to operate during lockdown or Covid-19 level 3
"The second reason for the drop off is families themselves have anxieties and concerns about bringing children, bringing infants to health services while there may be Covid around."
Māori children were disproportionately missing out, University of Auckland vaccinologist Dr Helen Petousis-Harris said.
"There's the issue of accessing services, and also more and more recently there's been misinformation that is really targeting Māori in particular ... those conspiracy theories are feeding into that and driving a further wedge."
Access to health services was the main issue affecting the potentially hundreds of children who may have missed their scheduled vaccinations in Hawke's Bay, the district health board's immunisation coordinator Fiona Jackson said.
There had been a "notable drop" in Māori and Pasifika children not getting their jabs in the last quarter.
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