Experts do not believe the virus escaped from the institute. One expert said that up to seven million people in Southeast Asia are infected each year with bat coronaviruses. He said there are probably only about six people who work with the viruses at the institute. It does not make sense that virus came from one of these of people compared with the millions of other people affected by bats. The staff at the Wuhan Institute of Virology were trained at US labs and follow high safety standards. The evidence shows that this is not a laboratory accident.