World Health Organization officials said not all people who recover from the coronavirus have the antibodies to fight a second infection, raising questions as to whether or not patients develop immunity after surviving Covid-19. The coronavirus has now infected over…

Rebecca Frasure tested positive for the coronavirus and was quarantined in Japan for 28 days. After finally testing negative, she and her husband have returned to the US. Here’s what they’re worried about now. Human trials for a potential vaccine…