Pfizer CEO Albert Bourla on Tuesday said the omicron variant of the virus that causes Covid-19 appears to be milder than previous strains, but also seems to spread faster and could lead to more mutations in the future.“I don’t think it’s good news to have something that spreads fast,” Bourla told The Wall Street Journal during an interview at the paper’s CEO Council Summit. “Spreads fast means it will be in billions of people and another mutation may come. You don’t want that.”White House chief medical advisor Dr. Anthony Fauci said reports over the weekend from South Africa suggest omicron is not as severe as initially feared, while noting that more data is needed to fully assess the risk posed by the variant.The South African Medical Research Council, in a report released Saturday, said most patients admitted to a hospital in Pretoria who had Covid didn’t need supplemental oxygen. The report also noted that many patients were admitted for other medical reasons and were then found to have Covid.cnbc.com