What is an antigen?
An antigen is a substance that usually comes from your environment and makes you sick when it gets inside your body.
Common antigens include bacteria and viruses. Antigens trigger your immune system to produce antibodies, which fight back.
Antigens can get into your system much the same way you bring the substances you need to survive into your body. You can inhale airborne antigens into your lungs when you breathe, for example. Or you can bring antigens into your mouth when you, say, pick up an infectious substance like the coronavirus off a surface with your hands, then touch your face.
Antigens can also get into your body through your ears, eyes and nose. Rarely, but occasionally, you can absorb them through your skin.
Source:cnet.com...
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