The claim

「Green snot means bacterial infection needing antibiotics」

Q: Green snot means bacterial infection needing antibiotics

Myth — Snot turning thick and green is the natural course of a cold (immune-cell debris), not proof of bacteria. What matters: symptoms beyond ~10 days without improving, or persistent high fever.

Verdict

Myth

Snot turning thick and green is the natural course of a cold (immune-cell debris), not proof of bacteria. What matters: symptoms beyond ~10 days without improving, or persistent high fever.

Sources

CDC · Centers for Disease Control and Prevention
Centers for Disease Control and Prevention. (2025/09/23). Healthy habits: Antibiotic do's and don'ts. https://www.cdc.gov/antibiotic-use/about/index.html
Direct source · Government / official agency · checked 2026-10-13

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「Green snot means bacterial infection needing antibiotics」

Verdict

Sources

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Further reading