a molecule that can be recognized by the immune system...

http://en.wikipedia.org/wiki/Antigen

Making vaccines

Once scientists choose a type of vaccine to build, they need to decide how to produce the vaccine. Just like any product, the vaccine needs to be assembled in a particular way and made in sufficient quantities so that it can be delivered to the millions of people who need vaccines. The production of vaccines is usually done in a living organism or a group of cells. Because cells contain the cell parts needed to read the DNA instructions and create proteins, they are perfect “factories” to create vaccines.

Germs May Decrease Our Chances of Disease

Alex Biera

We are often taught that germs are bad, but what if exposure to germs or other microorganisms has long-term positive effects? Recent studies show that certain microbes in our environment might actually offer a protective effect against Alzheimer’s Disease.

Ouch - Body Defense and Repair

Kimberly Repp

Ouch! You just got a paper cut on your finger. What happens now? Besides the sting you are feeling from the cut, there are germs on that paper that are preparing to invade your body. For your immune system, this means war.
Also in: Türk

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