Cholera risk in Hanoi

Cholera Risk Prevention Guide for Hanoi Cholera is an acute diarrheal infection caused by the bacterium Vibrio cholerae. It spreads through contaminated water and food, and can cause severe dehydration and death within hours if untreated. Hanoi's risk score of 65/100 reflects a moderate-to-high danger, especially during the rainy season (May–October) when flooding contaminates water sources. Local Risk Factors: - Street food vendors using untreated water for washing and cooking - Inadequate sewage infrastructure in older districts - Monsoon flooding that mixes sewage with drinking water sources - Open-air markets with limited refrigeration - Shared communal water sources in peri-urban areas Actionable Prevention Steps: 1. Drink only boiled or bottled water. Avoid ice from street vendors unless you know it is made from treated water. Carry a portable water filter or purification tablets when visiting street food areas. 2. Eat thoroughly cooked, hot food. Avoid raw vegetables, unpeeled fruits, and undercooked seafood—especially shellfish from the Red River and nearby waterways. 3. Wash hands frequently with soap and clean water, particularly before eating and after using the bathroom. Carry hand sanitizer for situations where soap is unavailable. 4. Choose busy street food stalls with high turnover rates, as this indicates fresher food. Avoid stalls near open drains or stagnant water. 5. Consider getting the oral cholera vaccine before the rainy season if you plan extended stays or frequent exposure to high-risk environments. If you develop sudden, severe watery diarrhea, seek medical care immediately. Rehydration salts can be life-saving while traveling to a hospital. Hanoi's major hospitals, including the National Institute of Hygiene and Epidemiology, have experience treating cholera cases.