A federal panel of experts on Wednesday recommended an expansion of RSV vaccinations for adults and a new combination shot as ...

This electron microscope image provided by the Centers for Disease Control and Prevention shows a cluster of norovirus virions. (Charles D. Humphrey/CDC via AP, File) The CDC reports about 19 to ...

SEM stands for scanning electron microscope. The SEM is a microscope that uses electrons instead of light to form an image. Since their development in the early 1950's, scanning electron microscopes ...

FILE - This undated electron microscope image made available by the Centers for Disease Control and Prevention shows rabies virions, dark and bullet-shaped, within an infected tissue sample.

FILE - This undated electron microscope image provided by the Centers for Disease Control and Prevention shows rabies virions, dark and bullet-shaped, within an infected tissue sample.

FILE - This electron microscope image provided by the National Institutes of Health shows human respiratory syncytial virus (RSV) virions, colorized blue, and anti-RSV F protein/gold antibodies ...