British health chiefs quietly sneak out warning that Pfizer and Moderna's vaccines may cause heart damage in 'extremely rare' cases

British health chiefs have quietly released a warning that Pfizer and Moderna's Covid vaccines may cause heart damage, MailOnline can reveal.

Fears about the mRNA jabs' links to myocarditis have grown in recent weeks, following a string of cases in young adults and children in Israel and the US.

Now the UK's drug watchdog has updated its safety information to accept that the condition is a possible side effect of both vaccines, without a formal announcement.


The Medicines and Healthcare products Regulatory Agency insists the complication – inflammation of the heart muscle which can damage the organ over time – is still 'extremely rare' and 'typically mild'.

But it wasn't listed as a potential side effect until last week, when the MHRA released its most up-to-date safety surveillance data.

Cardiologists say the benefits of both jabs still clearly outweigh the risks for the vast majority of the population.

However, they say it 'completely changes' the debate about vaccinating children in Britain. They won't get AstraZeneca's jab because of its links to deadly blood clots in young people.

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