The virus often mutates by simply deleting small pieces of its genetic code. The mutations "disguise" the virus from antibodies.

Prior exposure to one strain of influenza virus may weaken children's ability to mount an effective antibody response against their subsequent exposure to a different flu strain, according to a study ...

In a new study published in Nature, University of Minnesota researchers found that the Marburg virus, one of the world's deadliest pathogens with an average 73% fatality rate, is unusually efficient ...