immune system, infection, vitamin d, white blood cells

Biology: How the Body Fights Infection

Your body remains healthy most of the time despite the fact that microbes and germs infect it regularly. This is largely thanks to your immune system, which is automatically triggered every time it detects infection by bacteria, viruses, parasites, or other microbial organisms. Fighting infection There are three types of blood cells — red, white, ...

Armin Auctor

White blood cells fighting an infection.