Cholera Person-to-Person Spread: Low Risk but Possible

Direct person-to-person cholera transmission is rare but documented — primarily in household/caregiver settings with poor hygiene.

Transmission Efficiency

• Waterborne: High efficiency (10³–10⁶ CFU infectious dose).
• Foodborne: Moderate (depends on vehicle).
• Direct contact: Low — requires fecal-oral transfer (contaminated hands → mouth).

High-Risk Scenarios

• Caring for cholera patient without gloves/handwashing.
• Shared latrines without hygiene.
• Funeral practices (washing body).
• Crowded households, refugee camps.

Prevention Checklist

1. Water: Treat (boil, chlorine, filter) — even if clear.
2. Food: Cook thoroughly, peel, avoid raw seafood.
3. Hands: Soap + water after defecation, before eating/cooking, after patient care.
4. Patient care: Gloves, dedicated utensils, disinfect vomit/feces (0.2% chlorine).
5. Vaccination: OCV for travelers to endemic areas, outbreak response.

Outbreak Context

In explosive outbreaks, waterborne dominates. Person-to-person sustains low-level transmission between waves. Both matter for elimination.