Water-borne Pathogens
Bacteria, viruses, and parasites transmitted through contaminated drinking water — responsible for most traveller’s diarrhoea and several life-threatening diseases.
Bacteria, viruses, and parasites transmitted through contaminated drinking water — responsible for most traveller’s diarrhoea and several life-threatening diseases.
Also known as
Water-borne Diseases, Waterborne Illnesses
Real-world example
You drink hotel tap water in Delhi and get sick 36 hours later. The culprit is almost always a water-borne pathogen — E. coli, Giardia, Shigella, or Norovirus. Prevention is entirely about sealed bottled or properly filtered water.
Country-specific notes
🇮🇳 South Asia
High infection rates.
India, Nepal, Pakistan, Bangladesh all have widespread water contamination including typhoid and cholera endemic zones.
Drink only sealed bottled or properly filtered water — avoid even brushing teeth with tap water.
🌍 Sub-Saharan Africa
Cholera and typhoid hotspots.
Cholera epidemics occur regularly; typhoid is endemic. Schistosomiasis also present in fresh-water lakes and rivers.
Never swim in still fresh water — Lake Malawi, Nile basin, etc.
🌎 Latin America
Varies sharply by country.
Mexico, Peru, Bolivia: tap water not potable. Chile, Costa Rica, most of Argentina: generally safe.
When in doubt, ask locals: if they drink the tap water, it is usually safe.
Frequently asked questions
What are the most common water-borne pathogens?
E. coli and Salmonella (traveller's diarrhoea), Giardia and Cryptosporidium (parasitic diarrhoea), Hepatitis A (liver), Cholera (severe diarrhoea), and Typhoid (systemic).
Is ice in drinks safe?
Only if made from filtered or bottled water. Ice in established hotels and international restaurants is usually fine; ice from street vendors is a common infection source.
Log ORS, loperamide, and antibiotics in your Nomedic kit, so the travel-clinic pharmacist and your GP are on the same page.