A leaked draft report on the World Health Organization (WHO) joint mission to China to probe the origin of SARS-CoV-2, the virus that causes COVID-19, says that transmission from bats or other animals to humans is the most likely source, with a lab leak unlikely.In other global developments, Brazilian researchers warned of an association between the P1 SARS-CoV-2 variant and higher rates of death in younger adults, and cases continue to climb in hot spot countries, with more nations announcing lockdowns.Experts dismiss lab-leak theoryThe WHO said it expects to officially release the report tomorrow, though the Associated Press (AP) first received a draft copy from a diplomat in Geneva.