A live virus vaccine contains a live, weakened (attenuated) virus that helps your body develop an immune response without you developing symptoms of the disease it is intended to prevent. Examples ...

Researchers have found that coronaviruses like SARS-CoV-2 contain genes that appear important for viral survival even though they don't produce a working protein. Their work investigating how these ...

Were there already viruses on Earth when the first living cells appeared ... molecules or energy and are too small to be seen without a microscope. By this definition, bacteria, archaea and ...

Smallpox has been eradicated worldwide since 1980 and is not held in check by vaccines, contrary to posts suggesting the ...