One who opposes, especially with animosity.
Where the adversary numbers in the millions.
Infectious organism that reproduces in the cells of an infected host. Viruses are not alive until they enter cells of the body where they grow and reproduce, causing viral illnesses.
Viruses are things on the very edge of life. You can't taste them, smell them or see them.
Occurring or prevalent over a wide geographic area as a disease; widespread.
The influenza pandemic of 1918 struck every major U.S. city, dropping people where they stood.
Medication used to provide immunity by vaccination. Vaccines are given mostly by injection or by mouth.
One of the most common ways to make a vaccine is to grow it in an unnatural host.
Proteins created in blood and body tissue by the immune system to neutralize or destroy sources of disease.
Proteins that bind to the surface of viruses, flagging them for death. Antibodies.