Doctor Cameron Kaiser, head of public health in California’s Riverside County, population 2.4 million, said there was much uncertainty when his team was tasked with quarantining the first group of Americans evacuated by the State Department from Hubei province, China, the centre of the coronavirus outbreak.There was still a lot they didn’t know about the severity of the virus, Kaiser said, but they needed to help the group return home. “Some things you just have to do,” he said. “You figure it…