How do germs get into your body?
Germs can get in your body through a cut, ride in on something you ate, filter through the air, or wait for you to rub your eyes after touching something that's infected.
Once inside, they start to breed.
From: How Your Immune System Fights Infection WebMD Medical Reference
PubMed Health: “The Immune System,” “What are the organs of the immune system?” “How does the immune system work?”
Johns Hopkins Medicine: “Immune System.”
Cystic Fibrosis Foundation: “Respiratory: What You Should Know About Germs.”
Merck Manual: “Defenses Against Infection,” “Overview of the Immune System.”
American Academy of Family Physicians: “Childhood Vaccines: What They Are and Why Your Child Needs Them.”
University of Rochester Medical Center: “What Are White Blood Cells?”
CDC: “Understanding How Vaccines Work.”
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