At an overall C19 prevalence of ~33% in the UK, it is not surprising, that 10-20% of children who there are among the hepatitis cases tested positive for SARS-Cov-2.
Wondering why they take this into account at all for their explanation tries, for the UK.
Still the Israeli cases might point stronger in that direction with 11/12 cases showing C19 has been there.<p>Checking might so still be a good idea.