H5N1 Bird Flu Virus Shows Reduced Severity with Pre-Existing Immunity
The H5N1 bird flu virus, a major pandemic threat, has historically claimed nearly half of all human cases, but in the US over the past 18 months, only one death was reported among 70 confirmed cases. Researchers believe that people’s immunity to the H1N1 virus, which emerged in 2009 and caused a global pandemic, may … Read more