It appears that a cleaning product designed to inactivate the coronavirus is the reason there has been a 10-fold increase in norovirus outbreaks at early childhood centres across Auckland over the past month.
Auckland regional medical officer of health, Dr Jay Harrower, says there's been a shift to using ammonia-based cleaning products, which don't completely get rid of norovirus on surfaces.
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Photo: RNZ Insight/John Gerritsen