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Medicine Facts

What is Herd Immunity?

No vaccine is 100% effective and usually does not work in 5% of those immunized. In addition, another 5% lose immunity after time. That means that, even after you are immunized, you could contract the ... Continue reading

The Plague

Plague is an infectious disease caused by the bacterium Yersinia pestis. The bacterium is found mainly in rodents, particularly rats, and in the fleas that feed on them. Other animals and humans ... Continue reading

Prairie dogs sometimes carry plague.

Mother Nature's Own Brand of Bioterror

We've been hearing a lot about smallpox lately, as a possible bioterror attack. But Mother Nature has her own brand of bioterror. Smallpox has been with us for about ten thousand years, since the ... Continue reading

Smallpox was active in ancient Egypt.

Encephalitis and Meningitis

Encephalitis and meningitis are inflammatory diseases of the membranes that surround the brain and spinal cord and are caused by bacterial or viral infections. Viral meningitis is sometimes called ... Continue reading