Ho Chi Minh City's Hand-Foot-and-Mouth Outbreak Passes 44,000 Cases as Dangerous EV71 Strain Circulates

HO CHI MINH CITY — Ho Chi Minh City has recorded 44,191 hand-foot-and-mouth disease (HFMD) cases so far in 2026, health officials confirmed on Thursday, October 29, surpassing the city's entire 2025 caseload with more than two months of the year still to run — and the confirmed circulation of enterovirus 71 (EV71), the strain most closely linked to severe neurological complications in young children, has sharpened concern among doctors, schools, and parents across southern Vietnam.

This article provides general health information only and is not medical advice. Parents concerned about a sick child should contact a healthcare professional promptly.

Illustration: A pediatric ward caring for young patients during the hand-foot-and-mouth outbreak in Ho Chi Minh City.

What Happened

According to data from the Ho Chi Minh City Center for Disease Control (HCDC), reported by TechTimes on October 29, the city logged 1,850 new HFMD cases in a single week between October 19 and 25, pushing the cumulative year-to-date total to 44,191 through epidemiological week 43. The city closed 2025 with roughly 35,440 HFMD cases for the full year, meaning the 2026 outbreak has already exceeded last year's total by about a quarter.

Weekly case counts climbed sharply in early September and have stayed above 1,400 per week for several weeks, above the five-year average. Of samples tested in laboratory surveillance, 60 were EV71-positive — evidence, authorities say, of established circulation rather than sporadic detection.

Hospitals in Ho Chi Minh City have also been receiving severe cases transferred from other provinces across southern Vietnam, functioning as a regional referral hub at a moment when pediatric wards are simultaneously managing a high volume of respiratory infections. Nationally, Vietnam registered approximately 100,000 HFMD cases between January and September 2026 — more than 2.5 times the same period a year earlier — and children under five account for roughly 87 percent of cases nationwide.

Background

HFMD is endemic across Southeast Asia, and Vietnam typically sees two transmission peaks per year — one in spring and a larger one in autumn. The disease is caused by enteroviruses, most commonly Coxsackievirus A16, Coxsackievirus A6, and EV71, and spreads through close contact, contaminated hands, surfaces and toys, and respiratory droplets. Most infections produce a self-limiting illness with mouth ulcers and a blister-like rash on the hands, feet, and buttocks, resolving within seven to ten days.

EV71 is the exception that worries clinicians. A neurotropic virus first isolated in California in 1969, it can cross the blood-brain barrier and infect the central nervous system, potentially causing brainstem encephalitis, acute flaccid paralysis, and neurogenic pulmonary edema, sometimes within 24 to 48 hours of symptom onset. Earlier in 2026, Children's Hospital 2 successfully treated two critically ill boys with stage-4 EV71 HFMD, both needing emergency ventilation, vasopressor support, and blood filtration.

Illustration: Handwashing with soap is one of the simplest and most effective ways to reduce hand-foot-and-mouth transmission.

Why It Matters

The numbers matter most because of who bears them. HFMD overwhelmingly strikes children under five, an age group that depends entirely on adults to recognize danger signs and act fast. Dr. Du Tuan Quy, head of the Infectious Diseases and Neurology Department at Children's Hospital 1, has cautioned that the window between the appearance of early warning signs and critical deterioration can close within hours — sometimes as few as six to eight.

Parents are urged to seek emergency care immediately if a child with HFMD develops a persistent or spiking high fever unresponsive to standard fever management, sudden startle reflexes or involuntary limb jerks during sleep, trembling limbs or sudden unsteadiness, or unusual drowsiness or altered consciousness. Delaying a hospital visit, even overnight, can allow neurological complications to advance beyond effective intervention.

There is also a transmission risk parents may not anticipate: according to Dr. Du, between 10 and 20 percent of people carrying EV71 show no symptoms at all, so a healthy-feeling adult can unknowingly infect children in their care — another reason caregivers should wash hands thoroughly with soap and water after returning home and before contact with young children.

One development distinguishes 2026 from every prior HFMD outbreak in Vietnam: an approved EV71-specific vaccine. Known as Envacgen, developed by Taiwan's Medigen Vaccine Biologics Corp. with Substipharm Biologics, it received marketing authorization from Vietnam's Drug Administration on March 17, 2026, and launched nationwide at approximately 300 VNVC vaccination centers on September 26, 2026. In its Phase III trial of more than 3,000 children across Vietnam and Taiwan, Envacgen showed 96.8 percent efficacy against EV71-related HFMD, and it is approved for children aged two months to under six years.

But the vaccine has an important limit that HCDC and clinicians have stressed: Envacgen targets EV71 only. It offers no protection against Coxsackievirus A16, Coxsackievirus A6, or other enteroviruses that cause HFMD, and most of the 44,191 cases logged in 2026 occurred before Envacgen was in widespread use.

What Happens Next

HCDC has activated enhanced surveillance protocols as children continue to attend school, a setting that historically amplifies HFMD transmission through close contact and shared surfaces. Health authorities have urged schools to enforce routine handwashing, disinfect shared surfaces daily, and notify local health authorities immediately when cases appear, rather than waiting for a cluster to form. Officials are also pushing for earlier case detection and stronger local treatment capacity to reduce severe cases requiring transfer to central hospitals. With the year's second HFMD peak typically extending through November and into December, no imminent decline is expected, and parents should treat the elevated-risk period as ongoing through at least the end of November.

Illustration: The EV71-specific Envacgen vaccine protects against the most dangerous hand-foot-and-mouth strain, but not against other HFMD viruses.

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FAQ

What is hand-foot-and-mouth disease?

A contagious viral illness mainly affecting children under five, caused by enteroviruses including Coxsackievirus A16, Coxsackievirus A6, and enterovirus 71. It causes fever, mouth ulcers, and a blister-like rash on the hands, feet, and buttocks, usually clearing within seven to ten days.

Why is EV71 more dangerous than other HFMD viruses?

EV71 can infect the central nervous system, causing brainstem encephalitis, acute flaccid paralysis, and neurogenic pulmonary edema, sometimes within 24 to 48 hours of symptom onset. Children reaching stage-4 disease face a significant risk of permanent neurological damage.

Does the new Envacgen vaccine protect against all hand-foot-and-mouth disease?

No. Envacgen protects against EV71 only, with 96.8 percent efficacy against EV71-related HFMD in its Phase III trial. It offers no protection against Coxsackievirus A16, Coxsackievirus A6, or other enteroviruses, so vaccination must be combined with hand hygiene and symptom monitoring.

What warning signs mean a child needs emergency care?

Seek emergency care immediately if a child with HFMD develops a persistent high fever that does not respond to standard fever management, sudden startle reflexes or involuntary limb jerks during sleep, trembling limbs or sudden unsteadiness, or unusual drowsiness or altered consciousness. Doctors warn the window before critical deterioration can be as narrow as six to eight hours.

How can parents and schools reduce the spread?

Frequent handwashing with soap, cleaning and disinfecting toys, floors, and commonly used items, keeping sick children home from school, and monitoring infected children closely for 7 to 10 days all help. Schools should enforce handwashing routines, disinfect shared surfaces daily, and notify local health authorities immediately when cases appear.

Sources

• TechTimes, "Ho Chi Minh City Hand-Foot-and-Mouth Outbreak Tops 44,000; EV71 Vaccine Won't Cover Most Cases," October 29, 2026.
• Ho Chi Minh City Center for Disease Control (HCDC), epidemiological week 43 data for October 19–25, 2026, as reported by TechTimes on October 29, 2026.
• ENCLAI, "Hand, foot and mouth disease in Vietnam: 6,945 cases in 90 days," October 10, 2026.
• Wu, B., et al., "Viral shedding and clinical differences in hand, foot and mouth disease associated with coxsackievirus A16 and coxsackievirus A10," BMC Pediatrics, October 29, 2026.