The WHO has declared the coronavirus a global pandemic. On today’s Post Reports, William Wan says the virus is sparing kids — and understanding why could be key to finding a treatment or vaccine. Political reporter Aaron Blake reports on Biden’s “Big Tuesday” wins. And Robert Samuels talks to a Bernie supporter who is second-guessing his behavior online.Read more:The coronavirus seems to be sparing kids, and understanding why may be crucial to defeat the virus. Follow our live coverage here.The results from Tuesday’s primary contests are still coming in, but Joe Biden pulled ahead of Bernie Sanders as the clear front-runner in the Democratic race for the White House. Sanders supporters are beginning to wonder whether the campaign tactics help or hurt his chance of a presidency. Subscribe to The Washington Post: https://postreports.com/offer