Polio Eradication: The Economics of the Last Mile

How India went from the world's polio hotspot to polio-free, why eradicating a disease can be worth its high final cost, and the challenges that remain.

In 2009, India reported more polio cases than any other country. Many experts doubted it could ever be polio-free. Yet India recorded its last case caused by wild poliovirus in January 2011, and in 2014 the WHO certified the South-East Asia region, including India, as polio-free.

The global campaign

The Global Polio Eradication Initiative was launched in 1988, when polio paralysed an estimated 350,000 children a year in more than 125 countries. Wild polio cases have since fallen by more than 99 percent. Today, wild poliovirus remains endemic only in Pakistan and Afghanistan.

How India did it

Pulse Polio, launched in 1995, organised national immunisation days where millions of volunteers and health workers gave oral polio drops to every child under five.
House-to-house visits reached children missed at booths.
Special attention to high-risk groups, such as migrant families, and to areas of Uttar Pradesh and Bihar where transmission persisted.
Community and religious leaders helped overcome vaccine hesitancy.
Better vaccines targeting specific virus types improved effectiveness.

The economics of eradication

Eradication is different from control:

Control means keeping cases low, requiring spending forever.
Eradication means removing the disease permanently, so spending can eventually stop, as happened with smallpox.

The last mile is extremely expensive: finding the final cases in remote or insecure areas costs far more per case than early efforts. But economists argue it can still be worth it, because the benefits last forever. Studies have estimated that polio eradication will generate net benefits of tens of billions of dollars, mainly from avoided paralysis and treatment costs.

Challenges

Insecurity and attacks on vaccinators in some areas.
Vaccine-derived polio: in rare cases, the weakened virus in oral vaccine can mutate and spread in under-immunised communities. This is being addressed with newer vaccines and injectable vaccine.
Funding fatigue: donors may lose interest as cases become rare.

A lesson for public health

India’s success showed that careful planning, huge mobilisation and persistence can beat a disease once thought impossible to eliminate.

The booth on the railway platform

During a Pulse Polio round, volunteers set up booths at railway stations and bus stands, giving drops to children travelling with their families. Such efforts ensured that even children on the move were not missed, which was crucial for stopping transmission.

Thinking the last cases are cheap to eliminate

The final cases are usually the hardest and most expensive to reach. Eradication is justified because the benefits are permanent.

Key takeaways

India recorded its last wild polio case in January 2011 and was certified polio-free in 2014.
Wild polio remains endemic only in Pakistan and Afghanistan.
Eradication costs a lot at the end, but its benefits last forever.
Insecurity, vaccine-derived polio and funding fatigue remain challenges.