“Norovirus is an RNA virus. It’s a tiny, micro that can cause gastroenteritis,” said ... “Norovirus is highly transmissible,” ...

“Norovirus is really the most common cause of this viral gastroenteritis ... virus. The CDC is tracking a rise in norovirus cases all over the United States. “This is remarkably transmissible ...

H5N1 bird flu samples collected from a severely ill patient in Louisiana show signs of mutations that may make the virus more transmissible to humans, the Centers for Disease Control and ...