hereA mass testing campaign targeting anyone who had visited the market in the past two weeks has been launched.About 9,000 workers at the market had been tested previously.Beijing now looks to be heading back into lockdown after raising the alert level from three to two.This change in threat level is expected to bring the cancellation of classes, a suspension of reopenings and stronger requirements for social distancing.The wholesale food market has been closed for disinfection, as has a second market where three cases were confirmed.Some residential communities around both markets have been placed under lockdown, so far affecting 90,000 people in a city of 20 million.The resurgence in China highlights public health experts’ calls for.