The affected children were mostly under the age of five and therefore not eligible for the jab, health agencies monitoring the situation say.
But this hasn’t stopped the claims – and other theories around lockdown or sending children back to school – being promoted as fact.
So what are the established facts of the cases so far?
As of 21 April 2022, the World Health Organization had recorded at least 169 cases of unexplained hepatitis – inflammation of the liver – in children in 11 countries since January. Of these, 114 were in the UK.
None of the five specific viruses (labelled A – E) which usually cause hepatitis was found, but the majority of youngsters tested did show up positive for a particular adenovirus – a common family of infections responsible for illnesses from colds to eye infections.
The specific one they had causes stomach bugs.