Overview
- A vaccine-derived poliovirus was found in a sewage sample taken at the Vijay Nagar pumping station on June 5, prompting a rapid response from local health teams.
- Authorities mapped the connected drainage network and launched a door-to-door survey across 12 localities that aims to cover about 30,000 households.
- Survey teams have so far visited 5,421 homes and identified 2,590 children under five for assessment and possible catch-up vaccination.
- Officials describe the detected strain as largely non-virulent and contained and say the response is being monitored by the Uttar Pradesh government, the NCDC and the WHO.
- The detection came from routine environmental surveillance, which looks for poliovirus in sewage as an early warning and underlines that high vaccine coverage is needed to stop vaccine-derived strains from spreading.