At 11 on a Thursday morning, Rajkumari balances a blue vaccine cold box in one hand and a pink file in the other. She knocks on an iron gate in Vijay Nagar, a densely packed neighbourhood in Ghaziabad. A little girl leans out from a second-floor window.

“Is there a small child in the house?” Rajkumari calls.

Moments later, a young mother emerges carrying her five-month-old daughter. Rajkumari records the details in her register. Beside her, an ASHA worker gently tilts the infant’s head back. Two drops of polio vaccine land on her tongue. The baby cries. Before leaving, Rajkumari pauses. “No child has been missed, right?” she asks. “Tell me honestly.”

The Warning in the Water

The urgency is not accidental. On June 5, a routine sewage sample collected from Vijay Nagar tested positive for vaccine-derived poliovirus. This is a rare strain that can circulate in areas where immunization coverage is low. India was declared free of wild poliovirus in 2014, but environmental surveillance remains the country’s primary early warning system.

When the virus appears in sewage, it signals a gap in immunity. Officials acted immediately. They traced the sewage network, identified 12 high-risk neighbourhoods, and launched an intensive vaccination drive covering about 150,000 people. The National Centre for Disease Control and the World Health Organisation are now monitoring the operation.

Mapping the Gaps

Rajkumari is one of hundreds of workers now navigating a complex, high-stakes map. The team weaves through narrow lanes lined with closely packed houses. Some doors stay shut. Others are locked, their occupants away at work. Each missed house is marked for a follow-up visit.

In the cluster of tin-roofed shelters beneath an under-construction apartment tower, the challenge shifts. Families from Bihar and nearby districts live here, often working at construction sites. Rajkumari and her colleague, Manisha, stop at every shack.

“Is there a child under five?”

When Shyam, a 32-year-old carpenter, spots the health workers, he calls for his young son. “Isko bhi pila do (Give him the drops too),” he says. For Shyam, the process is familiar. He recalls vaccination booths at government schools back in his home village. He knows the stakes.

The Challenge of Hesitation

Not every interaction is as smooth. Amit Pal, a vaccination worker, reports that some parents refuse to open their doors. Others insist there are no young children inside. When persuasion fails, supervisors return to counsel the family.

Reluctance is not limited to the city’s poorest areas. In the gated towers of Paramount Symphony, the conversations are different, but the hesitation remains. Auxiliary Nurse Midwife Usha Yadav recently spent 45 minutes persuading a mother to allow her child to receive the drops.

“We reviewed every area to make sure nothing had been missed,” says Dr. Soniya Patel, the Medical Officer In-charge. “We cannot miss any child.”

Key Takeaways

  • Early Warning: The virus was detected through environmental surveillance, which tests sewage for traces of pathogens even when no clinical cases are reported.
  • High-Risk Focus: Health officials identified 12 specific neighbourhoods in Ghaziabad as high-risk, targeting 150,000 residents for intensified vaccination.
  • Persistent Outreach: Teams are revisiting locked homes and using counseling to overcome parental hesitation, ensuring no eligible child under five is left unvaccinated.

What Experts Say

Public health experts emphasize that vaccine-derived poliovirus is a reminder that immunity must be maintained. While the virus is rare, it thrives in pockets of low coverage. The current campaign is designed to close those gaps quickly. By revisiting homes and redrawing maps, officials aim to build a wall of immunity that stops the virus from spreading further.

This article is for informational purposes only. Always consult a qualified healthcare professional before making any medical decisions.