Is C. diff contagious?
Last updated September 3, 2026.
Yes - C. diff spreads through spores shed in stool that survive on surfaces for months, and the next person swallows them from contaminated hands. The risk context: most cases occur during or soon after antibiotics, which wipe out the gut bacteria that keep C. diff in check. Soap and water beat sanitizer - alcohol does not kill spores - and bleach beats most cleaners. Watery diarrhea three or more times a day during or after antibiotics means call the doctor.
What to do
- Wash with soap and water. Alcohol-based sanitizer does not kill C. diff spores.
- Clean with bleach products. Ordinary cleaners leave spores alive on bathroom surfaces.
- Respect antibiotics. Only when needed, exactly as prescribed - the course is the biggest controllable risk.
- Call early for the diarrhea pattern. Watery diarrhea repeatedly during or after antibiotics, especially with fever: do not wait.
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