Infection, Detection, Protection     Meet the Microbes
Pictures of HIV and Influenza.
Masters of mutation: Viruses have the power to change quickly to survive in different environments. Micro-pirate alert: Unlike bacteria and protozoa, viruses can't live on their own. They invade plant and animal cells for survival and to create more viruses.
Achoo!:  The most common type of virus is the cold virus. There are 130 different kinds.
One time only: Normally, once your body has fought off a particular virus, you can't get sick from that virus again.