A global surge in mysterious hepatitis cases in children may have been caused by lockdown and social distancing, health chiefs have warned as cases in the US rose to 11. Officials probing the outbreak in Britain said a lack of exposure to common infections during their 'formative' years may have left more children than usual vulnerable to the deadly liver disease. Many experts warned during the pandemic that locking down children, despite their low risk of severe Covid, could weaken their immunity against other illnesses, as well as hamper their education and long-term health. Three-quarters of cases in the UK...