Researchers at the Murdoch Children’s Research Institute in Melbourne, Australia, made an exciting announcement late last week: They’re planning to test among health care professionals a century-old vaccine’s ability to fight COVID-19. “We hope to see a reduction in the prevalence and severity of COVID-19 symptoms in healthcare workers receiving the BCG vaccination,” Professor Nigel Curtis, a clinician-scientist who leads MCRI’s Infectious Diseases Research Group, said in a press release.