Many countries are detecting an increase in the number of sudden onset hepatitis cases in children (generally 1 to 10 years of age).
There is no basis for the belief that Covid vaccines are responsible...
"None of the current cases aged under 10 years old in the UK is known to have been vaccinated." and "Almost all of the cases have been seen in children under 10, with most cases aged between 3 and 5 years." - UK Health Security Agency (2022-05-09)
https://ukhsa.blog.gov.uk/2022/05/09/an-increase-in-hepatitis-cases-in-children/
"Only a tiny minority of the affected children were vaccinated against SARS-CoV-2; vaccines are not available for children under 5 years old, the age group in which most cases occur." - Science (2022-05-19)
https://www.science.org/content/article/what-s-sending-kids-hospitals-hepatitis-coronavirus-adenovirus-or-both
"Of the 63 cases with data on COVID-19 vaccination, 53 (84.1%) were unvaccinated." - European Centre for Disease Prevention and Control and World Health Organization joint bulletin (2022-05-20)
https://cdn.ecdc.europa.eu/novhep-surveillance/
"Almost all of the cases have been seen in children under 10, with most cases aged between 3 and 5 years." - UK Health Security Agency (2022-05-09)
https://ukhsa.blog.gov.uk/2022/05/09/an-increase-in-hepatitis-cases-in-children/
"A study of the hepatitis cases seen in Israel reveals they were likely a delayed consequence of COVID-19. The average delay was 74 days (range 21-130). This is almost certainly why we’ve mostly seen negative COVID-19 PCR tests in affected kids."
– Dr. Zoë Hyde https://twitter.com/DrZoeHyde/status/1535947425294483456?s=20&t=5tIDEI4U1jKMo_0YE1GFuQ
Study: https://journals.lww.com/jpgn/Abstract/9900/Long_COVID_19_Liver_Manifestation_in_Children.84.aspx (2022-06-10)