Shot developed in Defense Ministry's secretive Institute for Biological Research has already proven effective in animals

UN health body chief says in the meantime, it comes down to basics of public health and disease control; says team has laid groundwork in China for probe of pandemic's source

But officials testifying at a contentious House hearing acknowledge US remains unable to deliver all COVID-19 test results within two or three days

Russia, suffering from the world's fourth-largest coronavirus caseload, hopes to beat the West in developing a usable coronavirus vaccine

Noam Tau worries even if virus shot is developed, US could fail to achieve herd immunity; his research seeks to debunk their claims and shows public can trust FDA on vaccine safety

President and Pence visit laboratories, marking beginning of largest vaccine research trial yet; White House officials hoping vaccine could provide 'October surprise'

Shot developed by NIH and Moderna to be tried on 30,000 people in coming months, with Israel among countries rooting for its success

British health officials say vaccination program amid coronavirus pandemic is 'biggest in history,' amid fears seasonal illness will compound damage caused by COVID-19

Top health official also announces development of cheaper version of remdesivir and favipiravir, which are believed to be helpful in treating some serious COVID-19 cases

Initial research shows blood cells remember how to efficiently make new antibodies in case of reinfection, meaning someone can have immunity even without antibodies