The virus found a population with almost no immunity
Uma pandemia raramente chega sozinha — ela abre brechas por onde outras ameaças avançam. Enquanto o mundo concentrava seus recursos no combate à COVID-19, o sarampo encontrou o caminho livre: 23 milhões de crianças deixaram de ser vacinadas em 2020, e os primeiros meses de 2022 revelaram as consequências, com casos quase dobrando em relação ao ano anterior. A OMS e o UNICEF alertam que o custo dessa interrupção não será pago apenas agora — mas ao longo de décadas, em vidas e em sofrimento que poderiam ter sido evitados.
- Os casos de sarampo saltaram de 9.600 para mais de 17.300 entre janeiro e fevereiro de 2022, sinalizando uma crise que já não pode ser ignorada.
- A COVID-19 paralisou campanhas de vacinação em todo o mundo, deixando 23 milhões de crianças sem proteção básica — o pior índice desde 2009.
- Somália, Iêmen, Afeganistão, Nigéria e Etiópia concentram os surtos mais graves, em sistemas de saúde já destruídos por conflitos e pobreza.
- O deslocamento de populações pela guerra — na Ucrânia e em outras regiões — amplifica o risco de propagação em comunidades sem cobertura vacinal.
- Autoridades de saúde global pedem campanhas urgentes de recuperação, alertando que a janela para evitar tragédias de longo prazo está se fechando.
A pandemia de coronavírus fez mais do que adoecer milhões de pessoas. Ela desmantelou silenciosamente os sistemas que mantinham o sarampo sob controle ao redor do mundo. Nos dois primeiros meses de 2022, agências de saúde contabilizaram mais de 17.300 casos da doença — quase o dobro dos 9.600 registrados no mesmo período de 2021. A OMS e o UNICEF emitiram um alerta claro: milhões de crianças estavam vulneráveis a uma doença que, há décadas, era evitável.
Em 2020, enquanto hospitais colapsavam sob o peso da COVID-19, campanhas de vacinação foram interrompidas em país após país. O resultado foi que 23 milhões de crianças deixaram de receber as doses básicas contra o sarampo naquele ano — o número mais alto desde 2009, e 3,7 milhões a mais do que em 2019. Cada dado representava uma criança sem defesa contra um vírus que se espalha pelo ar com facilidade assustadora.
A crise não se distribuiu de forma igual. A Somália registrou mais de 9.000 casos nos doze meses anteriores. Iêmen, Afeganistão, Nigéria e Etiópia completavam o quadro — países onde os sistemas de saúde já eram frágeis antes da pandemia. Os próprios mecanismos de vigilância epidemiológica foram comprometidos pela COVID-19, sugerindo que a dimensão real da crise era ainda maior do que os números oficiais indicavam.
O que tornava o momento especialmente perigoso era a convergência de crises. Conflitos armados deslocavam populações inteiras — na Ucrânia e em outras regiões — criando condições ideais para a propagação acelerada de doenças. O diretor-geral da OMS, Tedros Adhanom Ghebreyesus, advertiu que as interrupções nos serviços de imunização teriam consequências sentidas por décadas, e convocou os países a lançarem campanhas de recuperação imediatas.
O sarampo é um vírus de brutal eficiência: transmite-se pelo ar, pode causar cegueira, inflamação cerebral, infecções respiratórias graves e, em alguns casos, a morte. A vacina existe, está disponível e é eficaz. O que se rompeu foi a capacidade de aplicá-la em escala. Enquanto os sistemas de saúde tentavam se recuperar da COVID-19, a pergunta que permanecia era se conseguiriam agir rápido o suficiente — antes que o sarampo cobrasse, em crianças, o preço do atraso.
The coronavirus pandemic did more than sicken millions. It quietly dismantled the machinery that had been keeping measles at bay across the globe. By early 2022, the consequences were becoming impossible to ignore. In just the first two months of that year, health agencies counted more than 17,300 cases of measles worldwide—nearly double the 9,600 cases reported during the same window in 2021. The World Health Organization and UNICEF sounded an alarm that would echo through the months ahead: millions of children were now at risk from a disease that had been, for decades, preventable.
The numbers told a stark story of disruption. During 2020, as hospitals buckled under the weight of COVID-19, vaccination campaigns ground to a halt in country after country. The result was that 23 million children missed their basic measles shots that year alone—the highest figure since 2009, and 3.7 million more than had gone unvaccinated in 2019. These were not abstract statistics. Each number represented a child whose immune system had no defense against a virus that spreads with terrifying ease, traveling through the air on a sneeze or a cough, requiring nothing more than proximity to find a new host.
The outbreak was not evenly distributed. Somalia bore the heaviest burden, with more than 9,000 cases recorded over the previous twelve months. Yemen, Afghanistan, Nigeria, and Ethiopia followed in the grim tally. These were countries where health systems were already fragile, already stretched thin by conflict and poverty, now forced to contend with the lingering chaos of a global pandemic. The surveillance systems meant to track disease spread had themselves been compromised by COVID-19, suggesting that the true scale of the crisis was likely far worse than the reported numbers.
What made the moment particularly precarious was the convergence of crises. As measles cases climbed, millions of people were being displaced by conflicts—in Ukraine and elsewhere—creating conditions where disease could spread with even greater speed and reach. Tedros Adhanom Ghebreyesus, the director-general of the WHO, spoke with the weight of someone watching preventable tragedy unfold. He noted that COVID-19 had not merely interrupted immunization services; it had overwhelmed entire health systems. The consequences, he warned, would extend far beyond the immediate moment. "For many other diseases, the impact of these interruptions in vaccination services will be felt for decades," he said, urging countries to launch recovery campaigns immediately.
Measles itself is a virus of brutal efficiency. It travels through respiratory secretions, requiring only a kiss or a sneeze to move from one person to another. The complications it produces can be severe: blindness, brain swelling, grave respiratory infections. In some cases, it kills. Yet the disease is entirely preventable. The MMR vaccine—protecting against measles, mumps, and rubella—has been available in public and private health systems for years. So has the four-in-one shot that adds protection against chickenpox. The tools existed. What had fractured was the will and capacity to deploy them at scale.
The crisis represented a collision between two pandemics: one that had dominated headlines and resources, and another that had been quietly building in the shadows. As health systems began to recover from COVID-19, the question became whether they could move quickly enough to close the vaccination gap before measles and other preventable diseases claimed the lives that the numbers suggested were at stake. The window for action was narrowing, and the cost of delay was being measured in children.
Citas Notables
The pandemic interrupted immunization services and overwhelmed health systems. For many diseases, the impact of these interruptions will be felt for decades.— Tedros Adhanom Ghebreyesus, WHO director-general
La Conversación del Hearth Otra perspectiva de la historia
Why did COVID-19 disrupt measles vaccination so completely? Couldn't health systems have kept both going?
The systems were simply overwhelmed. Hospitals filled with COVID patients, staff got sick or were redeployed, supply chains broke down. Vaccination campaigns require coordination, trained workers, cold chains for the vaccines themselves. When everything is in crisis mode, those programs collapse first.
Somalia had 9,000 cases in a year. That's extraordinary. What made it so vulnerable?
Somalia's health system was already fragile before the pandemic. Conflict, poverty, weak infrastructure. When vaccination campaigns stopped, there was no safety net underneath. The virus found a population with almost no immunity.
The WHO director said the impact would be felt for decades. What does that mean exactly?
It means we're not just talking about measles cases in 2022. Children who miss their vaccines now grow up with gaps in their immunity. If measles spreads, it spreads wider. Other diseases we thought we'd controlled start circulating again. The damage compounds.
Is there a way to catch up? Can they just restart the campaigns?
Yes, but it requires speed and resources. They need to reach millions of children quickly, in countries where health systems are still recovering. The longer they wait, the more cases occur, and the harder it becomes.
What about the displacement from Ukraine and other conflicts?
Displaced people often have no access to healthcare, no vaccination records, no stable place to receive shots. They're moving across borders, living in crowded conditions. It's exactly the environment where measles thrives.