Measles Surge Makes Guadalajara Mexico’s New Epicenter as 2026 World Cup Nears

On a recent morning in eastern Guadalajara, children shuffled into a public primary school wearing cartoon-printed face masks. At the gate, nurses in green vests checked vaccination cards and lined up syringes on a folding table. Above the courtyard, a sun-bleached billboard promised that in 2026 the city would “welcome the world” for the FIFA World Cup.

For now, it is welcoming back an old enemy: measles.

Mexico is in the grip of its largest measles outbreak in decades, a resurgence that began in early 2025 and has now pushed the country to the top of the Americas in cases and deaths. After more than a year of sustained transmission, the western state of Jalisco — and its capital, Guadalajara — has emerged as the new national epicenter just months before it is due to host World Cup matches.

By mid-February, federal health data indicated more than 9,000 confirmed measles infections and roughly 30 deaths nationwide since the start of the outbreak in early 2025. In the first weeks of 2026 alone, Jalisco accounted for well over half of the country’s new cases and had the highest incidence rate of any Mexican state, prompting emergency measures, a regional health alert and questions about how a once-eliminated virus found such fertile ground.

From measles-free to regional hotspot

The Americas were declared measles-free in 2016, after health systems drove transmission down to sporadic imported cases. Mexico, long a showcase for mass immunization campaigns, shared in that success.

That status has now been thrown into doubt. The Pan American Health Organization reported that the region registered nearly 15,000 confirmed measles cases and 29 deaths in 2025 across 13 countries, a more than 30-fold increase over the previous year. Mexico alone recorded roughly 6,400 infections and 24 deaths, the highest figures in the hemisphere.

In an epidemiological alert issued Feb. 4, the agency warned of “continued measles transmission in the Americas” and urged governments to strengthen surveillance, close vaccination gaps and prepare for mass gatherings. It noted that in the first three weeks of 2026, seven countries reported 1,031 new cases — 740 of them in Mexico.

“Measles is highly contagious but preventable through timely vaccination with two doses,” the organization said, calling for intensified outreach and immunization, particularly ahead of major events such as the 2026 World Cup.

How the virus moved from Chihuahua to Jalisco

The current outbreak traces back to early 2025, when the first confirmed case was detected in epidemiological week 5. Health officials have linked its origin to a Mennonite child who contracted measles while visiting relatives in Texas, where local outbreaks were underway, and then returned to rural communities in the northern state of Chihuahua.

With historically low vaccination rates and deep-rooted distrust of government programs in some Mennonite settlements, the virus spread quickly. By the end of 2025, Chihuahua had recorded more than 4,500 cases and around 22 deaths, many among unvaccinated children.

As emergency vaccination brigades fanned out across northern ranchlands and infection curves in Chihuahua began to bend downward, measles found new footholds elsewhere. One of them was Jalisco.

State figures show Jalisco logged several hundred cases in 2025, far fewer than Chihuahua. But in the final weeks of that year and the opening month of 2026, infections in and around Guadalajara accelerated sharply. According to federal daily outbreak reports summarized by Mexican media, Jalisco nearly tripled its 2025 case count in a little over a month.

By Feb. 5, Jalisco had recorded 1,163 confirmed measles cases in 2026, out of 1,981 nationally. That gave the state 58.7% of all infections reported in Mexico so far this year and an incidence of nearly 13 cases per 100,000 residents — the highest rate in the country.

“Jalisco is now the epicenter of the measles outbreak in Mexico,” local outlet UnoTV reported that day, citing federal Health Ministry data. Other national newspapers and television stations quickly adopted the same language.

Roughly four out of five of the state’s cases have been concentrated in the Guadalajara metropolitan area — a sprawling urban corridor of more than 5 million people that includes the municipalities of Zapopan, Tlaquepaque, Tonalá, Tlajomulco de Zúñiga, El Salto and Ixtlahuacán de los Membrillos.

Classrooms on the front line

The surge has hit schools particularly hard. State and federal reports indicate that by early February, measles clusters had been confirmed in more than 50 schools across the metro area, with at least dozens of students and several teachers infected. Some campuses suspended in-person classes for specific groups or, in a few cases, entire schools for several days while contacts were traced and vaccinated.

On Feb. 3, Jalisco’s health secretary, Héctor Raúl Pérez Gómez, signed an order making face masks mandatory in public and private schools in seven Guadalajara-area municipalities for at least 30 days. The measure applies to students, teachers and staff and revives a tool many residents associated mainly with COVID-19.

“The use of face coverings in educational spaces is a temporary and preventive action to reduce the risk of contagion in the areas with the highest incidence,” Pérez Gómez said when announcing the order. He urged parents to check their children’s vaccination cards and “not let fear of the vaccine be more dangerous than the disease itself.”

The directive came as state health workers stepped up door-to-door visits and set up mobile teams in shopping malls and public squares to administer measles, mumps and rubella shots. Jalisco officials said they aimed to apply up to 350,000 doses per week during February in the affected municipalities, focusing on children from 6 months to 12 years and unvaccinated adolescents and adults up to age 49.

National scramble, mixed messages

The federal government has moved to frame the outbreak as serious but manageable.

President Claudia Sheinbaum has repeatedly sought to reassure the public that vaccine supply is not the problem. In mid-February, she said Mexico has about 28 million measles doses available and that more than 14 million doses had already been administered since 2025 through public campaigns.

“There are sufficient vaccines for the entire population,” Sheinbaum said at a news conference, urging parents to take children to any of the more than 21,000 health centers offering shots. “What we need is for people to go and get vaccinated.”

Health Secretary David Kershenobich has defended the government’s overall strategy, arguing that the very fact the outbreak numbers are in the thousands rather than the hundreds of thousands shows vaccination is working.

“If we did not have the vaccination coverage that we do, we would be talking about millions of cases of measles,” he told reporters in Mexico City on Feb. 12, citing 9,074 confirmed infections and an incidence rate of 6.7 per 100,000 inhabitants since early 2025.

Critics note that Kershenobich had taken a more optimistic tone months earlier. In November 2025, as cases in Chihuahua started to fall, he said the outbreak was in “clear decline” and “would not represent a risk” for the World Cup. The rapid escalation in Jalisco since has undercut that assessment and refocused attention on gaps left by years of uneven vaccination.

Health officials and outside experts broadly agree on the underlying drivers. Routine measles immunization in Mexico has fallen below the 95% coverage level needed to block sustained transmission. Children in poor or remote communities and young adults born roughly between the mid-1990s and early 2000s are more likely to have missed doses, whether because of underfunded health services, logistical problems or pandemic-era disruptions.

The regional health agency estimates that in 2025, nearly four out of five measles patients in the Americas with known vaccination status had not received their shots.

World Cup on the horizon

Guadalajara’s role as a World Cup host has added an international dimension to the health emergency. The city is scheduled to stage multiple group-stage matches in June 2026 as part of the expanded, 48-team tournament being co-hosted by Mexico, the United States and Canada.

International coverage has highlighted the juxtaposition of World Cup preparations and public health measures. An Associated Press report on the regional measles alert noted that Jalisco had Mexico’s highest incidence rate in early 2026 and that one of its World Cup host cities had reintroduced masks in schools.

The regional health agency has specifically warned that large-scale events and cross-border travel can accelerate the spread of measles, which can linger in the air for up to two hours and has one of the highest reproduction numbers of any known virus.

Mexican officials insist the outbreak will be under control long before kickoff. The question now is whether they can also satisfy international health auditors. The Pan American Health Organization has said that more than 12 months of continuous measles transmission can lead to a country losing its measles-free certification, a symbolic blow for a nation that once prided itself on its vaccine campaigns.

Some health experts have cited an informal deadline around April for Mexico to demonstrate that it has interrupted sustained chains of transmission.

A race against time — and complacency

Behind the national statistics are demographic details that underscore the stakes. Federal summaries show the highest number of cases in the 1- to 4-year-old age group, followed by children 5 to 9 and young adults in their late 20s. The age group with the highest incidence rate is infants under 1, who are too young to be fully vaccinated and depend on community immunity for protection.

Measles in small children can lead to pneumonia, brain inflammation and long-term weakening of the immune system, making survivors more susceptible to other infections. While the overall fatality rate in the current outbreak has remained relatively low, health authorities have confirmed nearly 30 deaths nationwide, most of them in 2025 in harder-hit northern areas.

In Jalisco, so far, officials say most cases have been nonfatal. But with new school clusters still being detected and mobile brigades racing to catch up with missed vaccinations, parents in Guadalajara are once again weighing familiar questions about sending children to classrooms during a health scare.

On a recent afternoon, as students streamed out of a primary school in the city’s Tepatitlán neighborhood, a teacher pinned a new vaccination schedule to the front gate next to a poster advertising next year’s World Cup matches.

For local health authorities, the coming months will be measured less in goals scored than in shots given: a test of whether Jalisco — and Mexico — can push measles back toward the history books before the world arrives.