The people most likely to die were least likely to show up
In Costa Rica, a national flu vaccination campaign has crossed 922,000 doses administered — a figure that, on its surface, suggests progress, but one that conceals a quieter failure: those most endangered by influenza are the least protected. As respiratory season approaches, the Social Security health system confronts the enduring paradox of public health — that the infrastructure of care and the reach of care are not the same thing, and that the most vulnerable are often the hardest to find.
- Costa Rica has distributed 61% of its 1.5 million flu doses, but the numbers hide a dangerous imbalance — working-age adults are vaccinated while the elderly, pregnant women, and children fall critically behind.
- Coverage among the most at-risk groups has dropped below last year's already-imperfect benchmarks: children at 26.5%, seniors at 37%, and pregnant women at 45% — each a threshold where preventable hospitalizations begin.
- Health authorities are racing against the respiratory season's peak, deploying mobile teams to rural communities, extending weekend clinic hours, and offering free, appointment-free vaccination at every health center in the country.
- Misinformation, fear of side effects, and the belief that flu is a minor inconvenience continue to erode uptake, forcing the health fund to fight a communications battle alongside a logistical one.
- The question now is whether expanded outreach will close the gap in time — or whether thousands of vulnerable Costa Ricans will enter peak season without the protection that was always available to them.
Costa Rica's flu vaccination campaign has administered more than 922,000 doses — roughly 61 percent of the 1.5 million distributed nationwide — and the numbers look steady. But when officials at the Costa Rican Social Security Fund examined who was actually receiving those doses, a troubling pattern emerged: the people most likely to suffer severe complications from influenza were the least likely to have been vaccinated.
Working-age adults between 8 and 57 years old accounted for nearly 472,000 doses and were largely on track. The vulnerable groups told a different story. Pregnant women had reached only 45 percent coverage — down from 57.5 percent the year before. Adults over 65 stood at just 37 percent, compared to 45 percent in 2025. Children fared worst of all, at 26.5 percent. These were not marginal shortfalls; they represented thousands of people entering high respiratory season without protection against a virus that, for them, can escalate into pneumonia, hospitalization, or death.
Dr. Elvis Delgado, who leads epidemiological surveillance for the health fund, acknowledged the gap plainly. The system responded by extending clinic hours, opening weekend sites, and dispatching mobile teams to rural and underserved communities. The vaccine remained free and required no appointment. Still, misinformation about side effects and a widespread underestimation of influenza's severity continued to suppress uptake, pushing authorities to intensify public messaging alongside their logistical efforts.
What distinguished this campaign was its candor about falling short. Officials knew the 2026 targets were not being met, and they said so. Community organizations and local governments were brought in to strengthen outreach; in remote areas, vaccination teams went door to door. The health fund's own data confirmed what was at stake — hospitalization and mortality rates fall when coverage rises. But data persuades institutions, not always individuals. As June arrived and the respiratory peak drew closer, the campaign pressed on, with priority given to the most vulnerable and the outcome still uncertain.
Costa Rica's national flu vaccination campaign has reached a milestone that looks impressive on paper but masks a troubling gap beneath the numbers. As of late May, health authorities had administered more than 922,000 doses—about 61 percent of the 1.5 million doses distributed across the country. The pace seemed steady. The infrastructure was in place. But when officials at the Costa Rican Social Security Fund looked at who was actually getting vaccinated, they found something that kept them up at night: the people most likely to die from the flu were the ones least likely to show up for a shot.
The breakdown revealed the problem clearly. Working-age adults between 8 and 57 years old accounted for 472,393 doses—they were doing fine. But the elderly, pregnant women, and young children—the groups for whom influenza can turn into pneumonia, hospitalization, or worse—were lagging badly. Pregnant women had reached only 45 percent coverage with about 15,400 doses administered, down from 57.5 percent the year before. Adults over 65 had managed just 37 percent, or roughly 237,000 doses, compared to 45 percent in 2025. Children were the worst off at 26.5 percent coverage, with just over 107,000 doses given. These weren't small shortfalls. They represented thousands of people heading into the high season for respiratory illness without protection.
Dr. Elvis Delgado, who oversees epidemiological surveillance for the health fund, said plainly that vaccination rates among pregnant women, elderly people, and children remained below what the system needed. The regional context made this urgent. Influenza carries real danger for people with chronic diseases, weakened immune systems, or pregnancy complications. The health authorities knew that respiratory illness peaks were coming in the months ahead, and they were racing against a calendar they couldn't control.
The health fund responded by changing tactics. They extended clinic hours, opened vaccination sites on weekends, and sent mobile teams into rural areas and communities that had shown low uptake. The vaccine itself was free and available without appointments at every health center in the country. Yet barriers persisted—misinformation circulated, some people feared side effects, others believed the flu wasn't serious enough to worry about. The health fund pushed back with messaging about safety and effectiveness, emphasizing that vaccination protected not just the individual but their family and community.
What made this campaign different from previous years was the explicit acknowledgment of failure. Last year, the system had achieved better numbers: 57 percent coverage among pregnant women, 45 percent among the elderly. The 2026 goal was to match or exceed those benchmarks. Instead, the campaign was falling short, and officials knew it. They worked with local governments and community organizations to strengthen outreach. In remote areas, vaccination teams went door to door. The message was consistent: no one should be left without protection.
The stakes were concrete. Hospitalizations and deaths from respiratory illness drop when vaccination rates climb. The health fund had data showing this. But data alone doesn't move people. What moves people is access, trust, and time—and in the weeks before the respiratory season peaked, all three were in short supply. The campaign would continue until doses ran out, with priority going to the most vulnerable. But as June arrived, the question hanging over Costa Rica's health system was whether the expanded outreach would come fast enough, or whether the vulnerable populations would face another season of preventable illness.
Citas Notables
Vaccination rates among pregnant women, elderly people, and children remain below what is needed— Dr. Elvis Delgado, epidemiological surveillance, Costa Rican Social Security Fund
The vaccine is safe and effective, protecting not only the vaccinated person but their family and community— Costa Rican Social Security Fund
La Conversación del Hearth Otra perspectiva de la historia
Why does it matter that working-age adults are vaccinated at such higher rates than the elderly? Isn't vaccination still vaccination?
Because the elderly are the ones who die. A 35-year-old with the flu gets sick for a week. A 75-year-old with the flu can end up in a hospital bed or worse. The numbers tell you where the risk actually lives.
But the vaccine is free and available everywhere. Why wouldn't someone just go get it?
Because "available" and "accessible" aren't the same thing. An elderly person in a rural area might not have transportation. A pregnant woman might be scared of side effects she read about online. A parent might not know the vaccine is safe for children. Access means nothing if trust isn't there.
The coverage rates dropped from last year. What changed?
That's the question nobody wants to answer directly. But you can guess: pandemic fatigue, misinformation spreading faster than health messages, people thinking the danger has passed. The system has to work harder just to stay in place.
What happens if they don't hit their targets before the respiratory season peaks?
Hospitals fill up. People who could have been protected end up needing intensive care. Some die. The system gets overwhelmed. It's preventable, which is what makes it urgent.
Are they going to make it?
They're trying. Mobile teams, weekend clinics, door-to-door outreach. But you can't vaccinate people who don't trust the vaccine or don't know it exists. Time is running out.