Likely cause of mystery child hepatitis outbreak found (bbc.com)

> "During the lockdown period when children were not mixing, they were not transmitting viruses to each other. > > "They were not building up immunity to the common infections they would normally encounter. > > "When the restrictions were lifted, children began to mix, viruses began to circulate freely - and they suddenly were exposed with this lack of prior immunity to a whole battery of new infections."