Zika Breaking News

As the peak tourist season and spring break 2026 approach, health authorities urge travelers heading to the sunny beaches of Cancun and the Riviera Maya to take extra precautions against mosquito-borne illnesses.

Although overall dengue cases in the Americas have significantly decreased in early 2026 compared to recent years, local transmission of key viruses continues in popular resort areas like Quintana Roo.

According to the latest data from the Pan American Health Organization (PAHO) posted on February 24, 2026, the Americas reported 122,090 suspected dengue cases through the end of January 2026.

The PAHO data indicate Mexico has experienced relatively low activity so far this year, with only 185 confirmed cases and about 1,972 probable cases nationwide in the first weeks of 2026.

However, Quintana Roo ranks among the states with the highest dengue activity, reporting 294 probable infections this year.

Aedes mosquitoes spread dengue and remain endemic in coastal regions. Symptoms include high fever, severe headache, eye pain, joint and muscle aches, nausea, and rash. In severe cases, it can lead to life-threatening complications.

Additionally, there is an elevated risk of chikungunya, which is transmitted by the same mosquitoes.

PAHO has noted an increase in chikungunya cases across parts of the Americas since late 2025, with a re-emergence in some areas after years of low activity. Locally acquired chikungunya cases have been reported in Quintana Roo and nearby states in early 2026.

Chikungunya causes intense joint pain that can last for months, along with fever and rash.

Zika continues to circulate at low levels in Mexico, with the U.S. Centers for Disease Control and Prevention (CDC) categorizing it as an area with current or past transmission. While most Zika cases are mild, it poses a serious risk to pregnant women due to the potential for congenital disabilities, such as microcephaly.

The risk of malaria in Cancun and surrounding resort zones remains very low, and the CDC does not recommend routine prophylaxis for these urban and tourist areas.

And recently, cases of New World screwworm myiasis have been reported in Mexico.

The CDC, along with health authorities such as the UK's TravelHealthPro, the Government of Canada, recommends that all travelers to Mexico—including Cancun—ensure they are up to date on routine vaccinations before departure.

Additionally, travel vaccine clinics offer expert advice for those visiting high-risk areas.

Note: Recent U.S. Embassy alerts for Quintana Roo (including Cancun, Playa del Carmen, Tulum, and Cozumel) have recently focused on security issues, advising shelter-in-place in some cases. Check official sources for the latest safety updates.

Southwest Airlines is facing significant operational disruptions on Monday, February 23, 2026, for select flights to Mexico due to ongoing civil unrest.

As of today, the airline has fully suspended operations to Puerto Vallarta (PVR), with no flights scheduled despite initially planning eight (four in each direction) from key hubs like Dallas Love Field.

The main impacts are concentrated on PVR and its surrounding areas.

Southwest's official travel advisory warns that there may be potential delays or cancellations for PVR services through Wednesday, February 25, 2026.

Flight tracking data from sources such as FlightAware indicates that Southwest has canceled approximately 75% of its PVR flights amid the unrest, following four confirmed cancellations on Sunday.

Other airlines, including American, Delta, and United, have also either halted or reduced their service to PVR and Guadalajara (GDL), with some reporting cancellation rates as high as 76% for flights to these destinations.

In contrast, flights to Cancun (CUN) from Southwest are not currently experiencing widespread cancellations or suspensions related to the unrest.

Although the U.S. Embassy has updated its security alert to include the Quintana Roo state—advising U.S. citizens in locations such as Cancun, Cozumel, Playa del Carmen, and Tulum to shelter in place due to potential road blockages and criminal activity—there have been no reported airport closures or extensive flight disruptions at Cancun International Airport.

Southwest continues to operate nonstop service to CUN from U.S. cities such as Houston Hobby, Dallas Love Field, and Chicago Midway, with real-time status indicating normal operations as of 1:41 pm CST.

However, some sources note Cancun as part of the broader list of affected areas, though without specific airline cancellations beyond general waivers offered by other carriers for flexibility.

Flights to other unaffected Mexican hubs, like Mexico City, also remain operational.

Southwest says it prioritizes passenger and employee safety and offers flexible options for affected passengers and employees. As of 2 pm today, the Southwest website had not posted an official statement regarding Mexico's civial unrest.

Previously, the U.S. State Department said travelers to any Mexican destination, including Cancun, should exercise caution and avoid affected areas.

The situation in Mexico continues to evolve rapidly, with authorities working to restore order, the U.S. government says.

Currently, no proof of vaccination is required to visit Cancun or other parts of Mexico.

With just a few weeks left until Spring Break 2026 in the United States, one of Mexico's most popular tourist destinations is facing concerns among travelers.

On February 23, 2026, travelers at Cancun International Airport faced significant disruptions, with dozens of flights delayed or canceled, leaving hundreds stranded amid heightened security measures. Airport officials have confirmed that Cancun International Airport (CUN) remains operational, with no reported closures.

The chaos at CUN stems from broader regional instability, prompting urgent security warnings from the U.S. Embassy in the area.

The disruptions are linked to road blockages and criminal activity across multiple Mexican states, which have indirectly impacted airline operations by complicating crew movements and logistics.

According to the U.S. government, while the most severe flight cancellations have hit airports in Puerto Vallarta and Guadalajara—where roadblocks have led to the suspension of most services—Cancun has not been spared. Reinforced security presence at the airport has helped maintain functionality, but airlines are working to stabilize schedules as ripple effects continue throughout the day.

Compounding the travel woes, the U.S. Embassy in Mexico issued an updated security alert on February 22, 2026, urging American citizens in Cancun and other parts of Quintana Roo state—including Cozumel, Playa del Carmen, and Tulum—to shelter in place until further notice.

The alert cites ongoing security operations, road blockages, and heightened criminal activity as the primary concerns.

The State Department's travel advisory for Quintana Roo remains at Level 2: Exercise Increased Caution, warning of risks from civil unrest. The local U.S. embassy emphasized that while no airports have been closed nationwide, travelers should monitor local media, check road conditions, and keep family informed of their whereabouts.

In addition to security concerns, travelers to Cancun and the surrounding areas in Quintana Roo should be aware of ongoing risks from mosquito-borne illnesses, including dengue, chikungunya, and Zika. These diseases, transmitted primarily by Aedes mosquitoes, have seen varying levels of activity in Mexico over the past two years.

Dengue remains endemic in Mexico, with significant fluctuations in case numbers. In 2025, Mexico reported approximately 141,421 totalcases, resulting in 85 deaths nationwide.

Quintana Roo and neighboring states such as Veracruz and Sonora accounted for a notable share of cases last year.

As of early 2026 (through epidemiological week 4), Mexico has seen low activity, with 185 confirmed cases and 1,972 probable cases reported in the first two weeks alone.

This is an 83% decrease compared to the same period in 2025, but experts warn of potential seasonal increases as the year progresses.

Chikungunya transmission in Mexico has been sporadic and low in recent years. In 2025, only a handful of cases were documented nationwide, with reports indicating just four confirmed infections, primarily in southern states like Quintana Roo, Chiapas, and Yucatan.

The Pan American Health Organization (PAHO) notes that Zika virus activity in Mexico has declined sharply since the 2015-2016 epidemic. In 2025, only four confirmed cases were reported nationwide, a significant drop from 30 in 2024.

The PAHO says Zika poses particular risks to pregnant women due to potential birth defects.

The U.S. CDC and PAHO emphasize mosquito bite prevention as the primary defense against dengue, chikungunya, and Zika, given the lack of widespread vaccines for all three.

While the World Health Organization recommends the second-generation Qdenga vaccine, it is unavailable in the USA. 

However, chikungunya vaccines are available and may be considered for travelers planning extended stays (e.g., 6 months or more) in areas with elevated risk, such as Quintana Roo.

Travelers with underlying health conditions and who are undervaccinated should seek pre-travel medical advice from a travel vaccine expert.

As the safety and health situations in Mexico evolve, travelers are urged to prioritize safety and heed official guidance from both Mexican authorities, the U.S. Embassy, the PAHO, and the CDC.

Puerto Vallarta, a popular beach resort in Mexico that welcomed over six million visitors in 2025, has recently experienced unrest.

Authorities in Puerto Vallarta declared a Code Red alert, advising both residents and tourists to stay indoors.

In response, the U.S. State Department and Global Affairs Canada have issued shelter-in-place travel advisories for Jalisco and nearby regions. As of late February 22, 2026, no tourists or civilians appear to be directly affected by the civil unrest.

However, Puerto Vallarta International Airport has seen multiple flight cancellations, impacting airlines such as Air Canada and WestJet.

While Puerto Vallarta is generally considered safer than other Mexican states, visitors are advised to monitor airline updates, official advisories, and local news, as the situation remains fluid.

The State Department recommends that Americans in Mexico register for the Smart Traveler Enrollment Program, a free service that provides digital alerts in case of an emergency.

According to the U.S. CDC's Travel Health Notices, cases of New World screwworm myiasis, measles, dengue, chikungunya, and malaria have been reported in various Mexican states in early 2026. The CDC suggests prospective travelers to Mexico speak with a travel vaccine advisor about immunization options before departing abroad.

Researchers at Stony Brook University have developed an oral vaccine candidate based on a genetically modified, attenuated strain of Listeria monocytogenes. This vaccine stimulates powerful anti-tumor immune responses directly in the gut.

Led by immunologist Brian Sheridan, PhD, the research shows that the vaccine generates tumor-specific CD8+ T cells in the gastrointestinal tract.

In mouse models of colorectal cancer, the oral vaccine significantly improved tumor control, especially when combined with immune checkpoint inhibitors. This combination increases the infiltration of cancer-killing T cells into tumors.

Published on February 5, 2026, in the Journal for ImmunoTherapy of Cancer, the study presents a potential new strategy to overcome immunotherapy resistance in colorectal cancer, which is one of the leading causes of cancer-related deaths worldwide.

"The clinical significance of our laboratory findings is underscored by the vaccine performance in treating established tumors," says Dr. Sheridan. "While this vaccine alone initially curtailed local tumor growth, its true potential was revealed when combined with existing immune checkpoint inhibitors."

"This combination therapy led to profound tumor control in the model and suggests that the vaccine can effectively 'turn on' the immune system in tumors that were previously resistant to standard immune therapy," he explained in a press release.

Furthermore, the method demonstrated that oral immunization combined with immune checkpoint inhibitors induced the accumulation of tumor-specific CD8 T cells within the tumor microenvironment. These specialized immune cells remain stationed in the gut and provide immediate and long-lasting protection against cancer cells, a response not achieved by vaccination or immune checkpoint inhibitors alone. 

While the results are promising in preclinical models, human trials will be necessary to assess safety and efficacy.

As the 2025-2026 influenza season progresses to its later stages, FluMist® —the only nasal spray flu vaccine in the United States—has officially sold out.

The sell-out of FluMist reflects typical end-of-season patterns, as it has a shorter shelf life compared to injectable flu vaccines.

FluMist, a live attenuated influenza vaccine (LAIV), does not require needles and is approved for healthy individuals aged 2 to 49.

According to AstraZeneca's FluMist website, the flu shot is "no longer available to order for the 2025-2026 flu season."

Users are encouraged to sign up for notifications ahead of the next influenza season.

As of February 20, 2026, AstraZeneca has not disclosed exact dose numbers for FluMist, as product-specific distribution and administration data are typically reported after the season ends. In other countries, FluMist® is known as Fluenz® Tetra.

Historically, FluMist has accounted for a smaller market share than injectable alternatives.

A key highlight of this season was the launch of FluMist Home in August 2025, which allowed for self- or caregiver administration.

This direct-to-consumer service enabled eligible individuals to order the vaccine online through a medical screening process, with home delivery in 34 states, covering approximately 80% of the eligible population.

Meanwhile, as the flu season continues to peak in some states, injectable vaccines remain available from healthcare providers and pharmacies across the USA. For the latest updates, visit cdc.gov/flu, flumist.com, or consult your healthcare provider.

Measles outbreaks have been reported in Europe this year, and cases in England have significantly increased in the first few weeks of 2026.

The UK Health Security Agency (UKHSA) reported on February 19, 2026, that 130 laboratory-confirmed cases of measles had been reported this year.

This indicates a rise of 34 cases since the previous weekly update.

The surge is primarily driven by an ongoing outbreak in North London, particularly in the borough of Enfield, where 50 cases have been confirmed. Nearby Haringey has recorded 10 cases, while Birmingham in the West Midlands accounts for 23 cases, making up 18% of the total.

Overall, 68% of cases are concentrated in London.

Fortunately, no measles-related deaths have been reported in 2026.

UKHSA officials urge parents and guardians to check their children's vaccination status and ensure they receive the MMR vaccine. Catch-up vaccination campaigns are currently underway, and vaccination records are published quarterly in health protection reports. Public health leaders emphasize that vaccination remains the most effective way to prevent the spread of measles.

With over 20 million annual visitors to London, this UKHSA advice is essential.

As measles cases continue to rise in London, visitors to these areas of England should consult a healthcare professional about vaccination options.