What needs to be done for polio eradication in India?

Area of Science:

• Public Health
• Infectious Disease Epidemiology
• Vaccinology

Background:

• Global polio eradication is jeopardized by persistent wild poliovirus transmission.
• India, a large country with ongoing polio cases, faces significant challenges in achieving polio-free status.
• Uttar Pradesh and Bihar remain polio-endemic despite extensive vaccination efforts.

Purpose of the Study:

• To highlight the critical role of Uttar Pradesh and Bihar in India's polio eradication efforts.
• To underscore the limitations of current strategies in controlling polio in these specific regions.
• To advocate for the development of novel vaccines or targeted strategies for Uttar Pradesh and Bihar.

Main Methods:

• Analysis of polio incidence trends in India, with a focus on Uttar Pradesh and Bihar.
• Review of the impact of Pulse Polio Immunization (PPI) rounds and monovalent oral polio vaccines (mOPV1, mOPV3).
• Examination of polio case origins and spread, including migrant populations and molecular epidemiology.

Main Results:

• Uttar Pradesh and Bihar have consistently reported polio cases since the program's inception in 1995.
• Increased PPI rounds and introduction of mOPV1/mOPV3 have not significantly reduced polio incidence in these states.
• Molecular studies indicate that polioviruses detected in other Indian states often originate from Uttar Pradesh or Bihar.

Conclusions:

• Uttar Pradesh and Bihar are critical barriers to India's polio eradication.
• Current vaccination strategies are insufficient to eliminate polio in these endemic regions.
• Development of new vaccines or tailored strategies is essential for achieving polio eradication in Uttar Pradesh and Bihar.