The Huanan Seafood Market, which had a cluster of cases at the start of the outbreak, has long been suggested as a possible place humans first became infected. The market dealt mainly in frozen seafood but also sold domesticated wildlife. That included rabbits, which are known to be susceptible to the virus, and bamboo rats and ferret badgers, which are suspected of being susceptible. At the WHO mission's closing news conference Tuesday, one team member said some of these animals have been traced to farms or traders in regions that are home to bats that carry the virus that is the closest known relative of the one that causes Covid-19.