INDIANA – Wastewater data shows a notable rise in influenza B and elevated levels of human metapneumovirus (HMPV) — two respiratory viruses that can cause serious illness, especially in children and older adults, and typically surge later in the season.
Flu B disproportionately affects younger populations, while HMPV, though less well known, can cause hospitalizations at rates similar to RSV and flu. Traditional testing can miss both viruses, making wastewater a powerful and unbiased tool to detect and track their spread.
According to the latest WastewaterSCAN data, flu B is now in the “High” category nationwide. HMPV is rising, and although it remains in the “Low” category nationally, it is in the “High” category in the West, Midwest, and Northeast. WastewaterSCAN monitors for both pathogens at 140+ wastewater treatment plants and shares data from 40 states on our public data dashboard — offering early insight that clinical data may miss.
This WastewaterSCAN reflects information from participating wastewater treatment plants through April 11, 2025.
Respiratory Viruses
Influenza
Indiana
- Influenza A is in the “Low” category with a downward trend in Bloomington and “Medium” with no trend in Carmel and South Bend.
- Influenza B is in the “High” category with steadily increasing in concentration and detections in Indiana.
National
- Influenza A remains in the “High” category nationally with high concentrations and no trend over the last three weeks.
- Influenza B is in the “High” category nationwide with high concentrations and no trend.
- 68% of samples were positive over the last three weeks.
Avian Influenza
Indiana
- There have not been any detections of H5 (the flu A subtype associated with H5N1 or avian influenza) in Indiana wastewater over the last three weeks.
National
- H5 has been detected at 78 WastewaterSCAN sites across 26 states.
- A nationwide heat map of H5 detections is linked here.
Respiratory Syncytial Virus (RSV)
Indiana
- RSV is in the “High” category with high concentrations and no trend in Indiana.
National
- RSV remains in the “High” category nationally, with high concentrations and no trend over the last three weeks.
COVID-19
Indiana
- COVID-19 is in the “Medium” category with medium concentrations and no trend in Indiana.
National
- COVID-19 is in the “Medium” category nationally, with medium concentrations and no trend over the last three weeks. Sequencing data shows that KP.1 is the most popular variant across all sites at 51.9%, followed by KP.3 at 15.3%.
Human metapneumovirus (HMPV)
Indiana
- HMPV is in the “Low” category in Indiana and is not in seasonal onset, although concentrations appear to be on the rise.
National
- HMPV is in the “Low” category nationally, with concentrations on the rise since late December. However, HMPV is “High” in the West, Midwest, and Northeast.
Gastrointestinal Viruses
Norovirus
Indiana
- Norovirus is in the “Medium” category in Bloomington and Carmel and “High” in South Bend.
National
- Norovirus remains in the “High” category nationally, with high concentrations and no trend in the last three weeks.
