Over 660 million pilgrims gathered at the Maha Kumbh Mela in Prayagraj, India, this past February, and I’m now seeing the downstream consequences in my California clinic. This year, I’ve treated several Americans who returned ill after ritual bathing in India’s sacred river. Their diagnoses have ranged from typhoid fever and multidrug-resistant E. coli to persistent giardiasis and polymicrobial gastroenteritis. Each patient described their pilgrimage’s profound spiritual meaning; none expected that a moment meant to cleanse the soul would require hospitalization thousands of miles from home.
As part of the pilgrimage, known as the Kumbh Mela, roughly 100 million to 150 million people crowd a few kilometers of riverbank over just a few weeks, creating Earth’s largest recurring mass gathering. Even the best sanitation systems buckle under such pressure.
During the peak of this year’s Maha Kumbh, India’s Central Pollution Control Board (CPCB) measured 49,000 fecal-coliform bacteria per 100 milliliters at the main bathing ghat. That’s roughly 20 times India’s national safety limit of 2,500 per 100 mL.
These mass immersions reshape the river’s ecosystem. After the 2015 Kumbh on the Godavari River, researchers found a 130-fold surge in bacterial abundance as human-associated microbes displaced native species. Dangerous pathogens follow suit. Surveys routinely find Salmonella typhi, toxigenic E. coli, Vibrio cholerae, giardia cysts, and hepatitis A and E viruses at popular bathing sites. Most concerning, the blaNDM-1 “superbug” gene, which disables our most powerful carbapenem antibiotics, spikes during festival weeks and persists downstream long after pilgrims depart.
The health impact extends far beyond India’s borders. For instance, approximately 85% of U.S. typhoid cases are imported from India or other South Asian countries, and these are frequently multidrug-resistant or extensively drug-resistant strains. Mass gatherings inherently increase the risk of spreading communicable diseases to participants’ countries of origin as pilgrims disperse globally, carrying with them not only common infections but also drug-resistant pathogens. Once pilgrims board international flights, resistant infections and lingering fevers end up in emergency rooms worldwide.
We know prevention works. Ahead of the 2019 Prayagraj Kumbh, Indian officials installed thousands of toilets, safe-water distribution points, and more than 100 medical posts. With technical support from the U.S. Centers for Disease Control and Prevention and India’s National Centre for Disease Control, comprehensive surveillance and rapid response protocols were implemented for events like the 2015 Nasik Kumbh Mela, which concluded without major public health incidents or outbreaks. For the 2019 Prayagraj Kumbh, an onsite disease surveillance system was established, which facilitated early outbreak detection and response.
Unfortunately, such comprehensive preparation remains the exception. CPCB audits continue to find sewage treatment plants along the Ganges running below capacity year-round. Real-time contamination data aren’t consistently posted at bathing sites where pilgrims could make informed decisions.
Practical steps can respect faith while curbing disease. Travelers planning Ganges immersion should receive hepatitis A and typhoid vaccines at least two weeks before departure and consider oral cholera vaccine for full-body bathing. They must treat all river water as non-potable, using bottled water even for teeth brushing, and practice meticulous hand hygiene. Standby antibiotics can be helpful for severe diarrhea, though persistent fever or bloody stool requires immediate medical attention.
Clinicians evaluating post-pilgrimage illness should maintain high suspicion for giardiasis and drug-resistant salmonella, even weeks after return. Health care systems in destination countries should prepare for seasonal surges in tropical infections.
Indian authorities and international partners need to treat Kumbh health security as a year-round priority. This means running sewage plants at full capacity continuously, publishing daily water quality data online and at bathing sites, expanding vaccination stations, and systematically tracking resistance genes in both river water and clinical isolates.
The Uttar Pradesh state government allocated approximately $650 million for the 2019 Kumbh Mela, covering infrastructure, security, and event management. This level of investment demonstrates both the scale of the challenge and the resources available for solutions. With India’s growing global health leadership, comprehensive Kumbh health security is achievable if we commit to making it a priority before, and not during, the next gathering.
Ritual bathing in the Ganges represents an act of profound devotion that deserves respect, not dismissal. By aligning infrastructure, surveillance, and traveler education with that devotion, we can ensure pilgrims return home with blessings and memories rather than pathogens.
Jake Scott, M.D., is a clinical associate professor of infectious diseases at Stanford University School of Medicine. The views expressed are his own.
