Every child deserves a fair start in life, and few things shape that start more powerfully than vaccines. They are the silent protectors, guarding little bodies from deadly diseases before those children even learn to speak. Yet, in 2023, a sobering reality continues to haunt the world’s public health narrative. Despite decades of progress, India remains one of eight countries where more than half of the world’s unvaccinated children still live.

An analysis recently published in The Lancet reveals an uncomfortable truth. In 2023 alone, around 1.44 million children in India didn’t receive even a single dose of the diphtheria, tetanus, and pertussis vaccine during their first year of life. Globally, that number stood at 15.7 million. These “zero-dose” children who have never received any routine vaccination are at an unacceptably high risk of contracting diseases that were supposed to be on the verge of eradication. Diphtheria, measles, and polio are not problems of the past. They are knocking at our doors again because too many children remain completely unshielded.

This isn’t a new problem. The roots stretch back decades. In 1980, five countries including India, China, Indonesia, Pakistan, and Bangladesh were home to more than half the world’s zero-dose children. Over the years, the numbers improved, but not evenly. The Global Burden of Disease 2023 Vaccine Coverage Collaborators, an international team of researchers led by the Institute for Health Metrics and Evaluation at the University of Washington, updated global vaccine coverage estimates across 204 countries between 1980 and 2023. They found that vaccine coverage worldwide had doubled against multiple childhood killers like measles, polio, tuberculosis, and pertussis.

Yet even those victories are under threat. The world saw a dramatic reduction of nearly 75% in the number of zero-dose children from 1980 to 2019. But then came COVID-19. The pandemic didn’t just cause a health emergency of its own; it shook the foundation of routine healthcare. Immunisation drives were interrupted. Health workers were diverted. Misinformation spread like wildfire. Vaccines, once symbols of safety and progress, suddenly became subjects of suspicion in many communities. And that skepticism didn’t stop at COVID shots it crept into childhood immunisation too.

The ripple effects of the pandemic are evident in the latest data. Between 2010 and 2019, before COVID-19 officially took over our headlines, measles vaccination rates had already declined in 100 of the 204 countries studied. Even in high-income nations, which traditionally show strong coverage, over half saw a drop in at least one critical childhood vaccine during the same period. It's an alarming reversal of decades of hard-won gains.

India, with its vast and diverse population, faces unique challenges. In many urban centers, access to vaccination is no longer the primary issue. The problem is now awareness, misinformation, and in some cases, sheer neglect. In contrast, in rural and remote areas, access continues to be a hurdle. Healthcare workers struggle with logistics, poor infrastructure, and cultural hesitancy that slows down vaccine acceptance.

The growing spread of vaccine misinformation is a battle India cannot afford to lose. WhatsApp forwards, viral videos, and local rumors have built walls of fear around vaccines in some communities. Many parents, often with little formal education, are overwhelmed by contradicting information. They hesitate. They delay. And some never vaccinate their children at all. What they may not realise is that in the absence of vaccines, these once-dreaded diseases like measles, diphtheria and polio are never really gone. They simply lie in wait for the next unprotected child.

Routine childhood vaccines are among the most cost-effective public health tools ever developed. They don’t just prevent illness; they prevent lifelong disability, economic hardship, and even death. Yet these zero-dose children remain vulnerable not just because of ignorance, but because of systemic gaps that governments and healthcare systems are still trying to fill.

The risk is not limited to individual children. When a large number of children remain unvaccinated, entire communities are at risk. Outbreaks of vaccine-preventable diseases can escalate quickly in such clusters. And in an interconnected world, a local outbreak can easily become a national crisis.

India’s vaccination program, under the Universal Immunisation Programme (UIP), has made commendable strides in recent years. With initiatives like Mission Indradhanush the government aimed to reach the unreached. But the pandemic was an uninvited detour. Many families missed their scheduled immunisations, and catching up now will require more than just reopening clinics. It needs rebuilding trust.

This should be a social mission. The children missing out on vaccines are not spread evenly across all communities. The data shows that the burden of zero-dose children is heavier among the poorest, most marginalised groups. In India, this includes remote tribal communities, migrant families, and the urban poor living in informal settlements. Immunisation inequity reflects broader social inequities and addressing it will require multi-layered, community-driven solutions.

It is worth remembering that zero-dose children are not just a statistic they are lives full of potential. Every unvaccinated child represents a missed opportunity to protect a generation from preventable pain and suffering. When vaccines are skipped, school days are lost, incomes are affected, and families fall into medical debt. The cost of inaction is not just borne by the child, but by society as a whole.

Experts worldwide now warn that unless accelerated progress is made, the global goal of halving the number of zero-dose children by 2030 will remain a distant dream. As of 2023, only 18 countries had achieved this milestone. The road ahead is long and uneven. Sub-Saharan Africa and South Asia account for two-thirds of the zero-dose population that must be reached in the next seven years. India, with its significant share, cannot afford to fall behind.

The solution is not simply more vaccines, but smarter strategies. Targeted immunisation drives in high-risk districts, mobile clinics in rural belts, community health ambassadors in slums, and local-language awareness campaigns through trusted voices are all part of the puzzle. The battle must be fought not just in hospitals, but in homes, on streets, in classrooms, and on smartphones.

Healthcare workers particularly ASHAs, ANMs, and community nurses are the unsung heroes of this movement. They walk miles, face resistance, and return day after day to convince families that a small prick in the arm is worth a lifetime of protection. Supporting these frontline warriors with better training, compensation, and respect is not just the right thing to do it is the essential thing to do.

India has the experience, the infrastructure, and the science to close the gap. What it needs now is the will, the urgency, and the leadership to ensure that not a single child is left behind. Because every child matters. Every vaccine counts.

As the world watches and measures progress towards 2030, let India not be counted among those who failed to protect their youngest. Let us reclaim our place among nations that prioritised prevention over cure, equity over convenience, and compassion over indifference.

In the end, vaccines are not just about health. They are about hope. Hope that a child can grow up without the shadow of illness. Hope that parents don’t have to fear every cough, every fever. Hope that a future free of preventable diseases is not just an ideal, but a reality we choose to build