About 48 hours after a Seattle woman received the first dose of an experimental vaccine against SARS-CoV-2, scientists in China—not to be outdone—announced that they had regulatory approval to launch an ambitious vaccine trial as well. The Seattle volunteer received a messenger RNA vaccine that Moderna Therapeutics developed to prevent infection with the pandemic virus. The Chinese scientists, representing CanSino Biologics, described their plans to evaluate a recombinant vaccine.