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A large cell that helps the body defend itself against disease by surrounding and destroying viruses or bacteria.


Mumps is another contagious viral illness that affects the glands around the ears, causing puffy cheeks and a swollen, painful jaw. It can also affect the testicles, the pancreas, and several other organs. It is spread from person to person…

Mucosal membranes

The soft, wet tissue that lines body openings specifically the mouth, nose, rectum, vagina, and other bodily openings.


Tiny organisms (including viruses and bacteria) that can only be seen with a microscope.


Inflammation of the covering of the brain and spinal cord (the meninges) that can result in permanent brain damage and death.

Memory cells

A group of cells that help the body defend itself against disease by remembering prior exposure to specific viruses or bacteria. These cells help your body respond quickly.


Measles is the most contagious viral illness. It is spread from person to person through coughing or sneezing.  Common symptoms include a cough, runny nose, inflamed eyes, sore throat, fever, and a red blotchy skin rash, and it can last…

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