【After Work Economics】Enterovirus 'Big Devil' May Strike Back After 7 Years? Experts Warn: A71 Strain Could Leave Lifelong Aftereffects

After school resumes, close interactions among children have led to a resurgence in enterovirus cases. According to the latest statistics from Taiwan's Centers for Disease Control (CDC), there were 7,058 emergency and outpatient visits due to enterovirus in Week 34 of 2026, a 5.5% increase from the previous week. So far this year, seven severe cases of enterovirus infection have been reported, five of which were caused by enterovirus D68.

While D68 has recently drawn attention, doctors warn that enterovirus A71—often called the 'Big Devil' among pediatricians due to its tendency to attack the nervous system and cause severe complications—poses an even greater threat.

The 'After Work Economics' expert series invited Dr. Chi Hsin, Chief of the Department of Pediatrics at Mackay Children's Hospital, and Dr. Mu Shu-Chi, pediatrician at Shin Kong Wu Ho-Su Memorial Hospital, to analyze the risks of different enterovirus strains, warning signs of severe illness, and parents' top concern: vaccination.

### Why Is Enterovirus A71 Called the 'Big Devil'?

Dr. Chi explains that enterovirus is not a single virus but a large group comprising over 100 types, including poliovirus, coxsackievirus, echovirus, and enterovirus A71. Infection with one type typically provides immunity against that specific strain, but does not protect against other types.

Most enterovirus infections cause symptoms such as hand, foot, and mouth disease, herpangina, fever, or sore throat. However, enterovirus A71 is more likely to invade the central nervous system, potentially leading to encephalitis, limb paralysis, myocarditis, and cardiopulmonary failure. The disease can deteriorate rapidly, even within hours.

Dr. Mu recalls treating a 4-year-old child who, after several days of fever, was admitted to the ICU. Tragically, the child passed away within six hours. Post-mortem testing confirmed severe enterovirus A71 infection.

She emphasizes that even if patients survive severe cases, they may suffer lifelong aftereffects such as paralysis, neurological damage, or inability to communicate normally—placing a long-term, heavy burden on both the child and the family.

### Younger Children at Higher Risk: Which Age Group Is Most Vulnerable?

Who is at the highest risk of severe enterovirus infection? Dr. Chi states that age is one of the most critical risk factors, with children under five being particularly vulnerable. Infants under six months require the highest level of vigilance.

Citing research data, Dr. Chi notes that infants under six months face a 5.17 times higher risk of severe illness and up to 25.23 times higher risk of death compared to children aged 6 to 10. Older siblings attending daycare or kindergarten may bring the virus home, increasing exposure and infection risk for younger siblings.

### Where Can Parents Find Information on Preventing Enterovirus A71?

Parents seeking more information on A71 infection risks, daily prevention, and vaccination can refer to educational materials provided by the following medical societies:

- Taiwan Society of Neonatology Public Education Zone - Taiwan Society of Pediatric Infectious Diseases Public Education Zone

**Vaccination Reminder**: According to the Taiwan Society of Pediatric Infectious Diseases' July 24, 2026, guidelines on A71 vaccine use, children aged six and above are not currently within the approved indication. Since the rate of severe illness is lower in this age group compared to infants, vaccination should be decided individually through discussion between families and physicians.

### Alcohol Doesn't Kill Enterovirus? Handwashing with Soap Is Key

Many people rely on alcohol-based hand sanitizers, but Dr. Chi warns that enteroviruses lack a lipid envelope, making alcohol disinfection largely ineffective. Relying solely on alcohol sprays is insufficient for prevention.

Daily protection should prioritize proper handwashing with soap, especially before eating, caring for infants, after using the toilet, and upon returning home. For surfaces and toys frequently touched by children, the CDC recommends disinfection using diluted bleach at appropriate concentrations.

### How to Administer the Enterovirus A71 Vaccine: Evaluation Possible from 2 Months Old

Currently, two inactivated whole-virus A71 vaccines are approved in Taiwan, both indicated for children aged 2 months to under 6 years. Different brands have varying dosing schedules, so parents should follow the vaccine’s package insert and physician evaluation for complete vaccination.

Updated guidelines from the Taiwan Society of Pediatric Infectious Diseases (July 2026) recommend vaccination for all children aged 2 months to under 6 years, regardless of prior infection history. For children aged 6 and above, outside the current approved indication, vaccination should be individually assessed through discussion with a physician.

As an inactivated vaccine, the A71 vaccine can generally be administered simultaneously with or at any interval from other vaccines. However, the final decision should be made by a physician based on the child’s health status, age, and existing vaccination records.

### If Any of These 5 Severe Warning Signs Appear, Seek Care Immediately—Don’t Wait for Fever to Subside

The CDC warns that infants and young children infected with enterovirus may experience rapid disease progression. Immediate hospitalization at a major medical center is required if any of the following severe warning signs appear:

- Lethargy, altered consciousness, or significantly reduced activity - Weakness or paralysis in limbs - Myoclonic jerks, unexplained startles, or sudden whole-body muscle contractions - Persistent vomiting - Rapid breathing or increased heart rate

Doctors emphasize that enteroviruses come in many strains. The current A71 vaccine only prevents A71 infection and offers no protection against D68 or other types. Therefore, even after vaccination, families must continue practicing handwashing with soap, environmental disinfection, staying home when sick, and avoiding contact with other young children to further reduce infection and transmission risks.