Have we misunderstood the Doherty modelling?; High viral loads in vaccinated people; COVID risks to children; and substance use and the developing teenage brain

Australia is pinning its hopes on modelling that says restrictions can start to ease once we hit vaccination targets, but will the high case numbers in NSW disrupt that plan? New research finds that people who are fully vaccinated but contract COVID can still carry high viral loads. Why are some countries seeing high numbers of children in ICUs, while others are not? And why are some teenagers more at risk of regular substance use? The answer - partly at least - may lie within the brain.