On 25 April, the World Health Organisation (WHO) announced that at least one child had died from a mystery strain of severe hepatitis. The following day, it was announced that investigations point towards the F41 strain of adenovirus as the likely cause. Despite this, the UK Health Security Agency said it cannot rule out other possible causes such as Covid-19.
Adenovirus has so far been identified in 40 out of the 53 hepatitis cases tested. While the majority of cases occur in the UK, where they now number 111, there are now 169 cases worldwide. To date, 11 children have received a liver transplant after contracting the disease, with the number of infected children only set to grow.

