# What Do You Call Pathogens Invading Body Tissue?

> The invasion and multiplication of disease-causing pathogens in body tissue is called an infection — different from contamination, which just means pathogens are present.

Canonical: https://fadejunkie.com/practice/sanitation/infection-definition  
Last updated: 2026-08-11

**The answer is infection. That's the specific term for when disease-causing pathogens invade and start multiplying inside body tissue.**

Contamination is a broader term — it just means pathogens are present somewhere, not necessarily inside tissue. Disinfection is the opposite process entirely, the act of killing pathogens off. Fission is unrelated cell-division vocabulary and has nothing to do with infection control.

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