The rise in hand, foot, and mouth disease, The emergence of EV71

The Evolution of HFMD: Why Certain Strains Pose a Greater Risk

Hand, foot, and mouth disease (HFMD) is often dismissed as a routine childhood illness, but the underlying virology tells a more complex story. While the disease is generally caused by enteroviruses—including Coxsackievirus and Enterovirus 71 (EV71)—not all strains behave the same way.

Recent data highlights a concerning trend: the significant presence of Enterovirus 71 (EV71) in patient samples. Unlike milder strains, EV71 is recognized as a primary culprit behind severe complications. When this specific pathogen takes hold, the risk shifts from simple mouth sores to critical neurological, cardiovascular, and respiratory issues.

For healthcare providers and parents, the challenge lies in early detection. Because EV71 can progress rapidly, the window for intervention is narrow. The ability to distinguish a mild case from one driven by a virulent strain is the difference between a routine recovery and a life-threatening medical emergency.

The “School-Effect”: Why Early Childhood Centers are the Frontline

The transmission dynamics of HFMD are heavily concentrated in environments where young children congregate. In urban centers like Hanoi, the data is stark: a vast majority—95%—of recorded cases are children under the age of five.

With thousands of preschools and family-based childcare groups operating in dense areas, these facilities often become the primary engines of transmission. The close physical contact inherent in early childhood education makes schools the highest-risk environments for rapid spread.

However, this risk also presents an opportunity. Because the virus concentrates in these hubs, schools are also the most effective locations for control. By implementing strict sanitation and monitoring protocols, health authorities can effectively “break the chain” of infection before it reaches the wider community.

Building a Community Shield: Moving Beyond Clinical Treatment

While medical treatment is essential for severe cases, the long-term trend in managing HFMD is shifting toward a “preventative shield” model. This approach emphasizes that the responsibility for child health extends beyond the walls of a clinic.

Vo Hai Son, Deputy Director of the Department of Disease Prevention at the Ministry of Health, emphasizes that proactiveness is the key factor in an unpredictable epidemic. The “first gatekeepers” are the parents. When families monitor their children for early signs—such as fever, mouth ulcers, or blisters—and seek immediate medical attention, they prevent the disease from escalating.

A critical component of this shield is the social responsibility of isolation. Keeping a sick child home from school is not merely a health precaution for the individual; it is a necessary action to prevent educational facilities from becoming sources of cross-infection for hundreds of other children.

Future Outlook: Integrating Sanitation with Surveillance

The strategy currently being deployed in Hanoi provides a blueprint for future outbreak management. The focus is moving toward a dual-track system: aggressive environmental sanitation and high-level epidemiological surveillance.

By coordinating ward and commune health stations with local schools, authorities are implementing weekly general sanitation, particularly during peak months. This proactive disinfection aims to eliminate virus particles from surfaces before they can infect the next host.

Looking forward, the integration of community-level surveillance will be vital. Detecting “little outbreaks” early allows health officials to handle them thoroughly, preventing the formation of the large-scale epidemics that have seen case numbers climb—such as the over 34,000 cases and 8 deaths recorded nationally as of mid-April 2026.

For more information on pediatric health and infectious disease prevention, visit the World Health Organization or explore our latest health alerts.

Frequently Asked Questions