Understanding Enteroviruses

Overview of Enteroviruses

Enteroviruses represent a diverse group of RNA viruses responsible for various infectious diseases, including hand, foot, and mouth disease, as well as conditions affecting the brain and heart, pneumonia, and hepatitis. In the United States alone, there are over a hundred different types of enteroviruses that contribute to nearly 15 million infections and tens of thousands of hospitalizations annually, predominantly affecting children under the age of 10.

Seasonal Patterns of Virus Outbreaks

These viruses are found in the respiratory secretions, saliva, or feces of infected individuals and are typically transmitted through close contact, such as touching or shaking hands. Enterovirus infections often reach their peak during the summer and fall, with outbreaks occurring intermittently. For instance, EV-A71, a significant contributor to hand, foot, and mouth disease, exhibits a distinct pattern, occurring every three years in Malaysia and Japan, while China experiences a one-year cycle. Currently, there are no vaccines available for enteroviruses, making good personal hygiene essential for reducing infection risk.

Predictive Modeling of Virus Outbreaks

A recent study published in Science by scientists from Imperial College London introduced a mathematical model designed to analyze the incidence changes of the 20 most common enterovirus types over time. Utilizing time-series analysis and surveillance data from Japan collected between 2000 and 2016, the researchers discovered a strong correlation between the annual birth rate and outbreaks of specific enteroviruses. They also noted a time lag between outbreaks, likely due to the development of immunity among children. The predictive model successfully forecasted subsequent outbreaks in 2015 and 2016 for the majority of enterovirus types.

Preparing for Future Outbreaks

Looking ahead, this model could serve as a valuable tool for predicting when the next enterovirus outbreak may occur, its potential magnitude, and the specific types involved. Such information can assist healthcare practitioners in preparing for future outbreaks. Further validation regarding the social and demographic factors influencing transmission dynamics is necessary to enhance the accuracy of these predictions.

Reference

Pons-Salort, M. & Grassly, N.C. Serotype-specific immunity explains the incidence of diseases caused by human enteroviruses. Science. 2018; 361(6404):800-803. DOI: 10.1126/science.aat6777.