An infectious disease physician and expert in biochemistry says the risk of myocarditis after a Covid-19 vaccine is very rare but needs to be monitored. Coroner Robin Kay has released the findings into the death of a 13-year-old on Wednesday. He couldn't determine whether the boy's second dose of the Pfizer vaccine, 10 days before, was a cause of his fatal myocarditis - or whether another virus was to blame. University of Otago professor of biochemistry Kurt Krause spoke to Ingrid Hipkiss.

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