Respiratory Virus RSV Prompts Extended Public Health Measures in the U.S.

This year, RSV activity is notable because of its persistence into spring. Public health monitoring systems, including wastewater analysis, have detected moderate circulation in many regions. The Midwest and northern Plains, in particular, are experiencing higher levels of infection than expected.

Experts suggest several factors may contribute to this unusual pattern:

Behavioral Changes – Increased indoor gatherings, changes in mask use, and travel patterns may allow viruses to circulate longer.
Immunity Gaps – People who had limited exposure to RSV last season may have lower immunity, making them more susceptible to infection.
Climate and Environmental Factors – Mild temperatures and humidity levels can influence viral survival and transmission, potentially extending seasonal activity.