In Washington's Covid-19 outbreak, new variants flout old 'close contact' rule

Washington, DC is coping with a cluster of high-profile Covid-19 cases after a series of public events exposed high-level officials. House Speaker Nancy Pelosi, Sens. Susan Collins and Raphael Warnock, and Rep. Peter DeFazio have all this week announced that they tested positive. Health experts say the outbreak may be rooted, in part, in outdated and confusing guidelines from the US Centers for Disease Control and Prevention that help people assess their risk of getting the virus that causes Covid-19 or passing it on to others.