An estimated 38 trillion bacteria live in the human body—and only a small fraction are harmful to our health. However, the ...

Influenza, or the flu, is a contagious virus that affects your breathing and attacks your immune system. The flu mainly ...

VIVIAN, LA - DECEMBER 12: With a temperature of 103.8, Asa Moore, 6, of Vivian, Louisiana is examined by John Messier, a physician's assistant, at the North Caddo Surgical and Medical Center for ...

Hantavirus is a life-threatening infection carried by wild rodents. Human transmission is possible through inhalation of virus particles found in rodent saliva, urine, or droppings. This infection can ...

Find out how different vaccines for the coronavirus cause your body to create antibodies that fight the virus.

Giant viruses play a role in the survival of single-celled marine organisms called protists. These include algae, amoeba, and flagellates, that form the base of ocean food webs. And since these ...