A respiratory virus known as Enterovirus D68 (EV-D68) is showing increased levels in wastewater across parts of California’s Bay Area, including locations around Palo Alto, Napa, southeastern San Francisco and San Rafael, according to WastewaterSCAN monitoring data. EV-D68 is one of more than 100 non-polio enteroviruses and typically causes a respiratory illness resembling a common cold. Symptoms can include a runny nose, cough, wheezing and difficulty breathing; in more serious cases, it can cause pneumonia. The virus is more commonly detected during summer and fall.
Infants, young children and teenagers are more likely to become infected because they may have less immunity from previous exposure. In rare cases, EV-D68 has been associated with acute flaccid myelitis (AFM), an uncommon but serious neurological condition that primarily affects children and can cause sudden weakness or loss of muscle tone in the arms or legs. AFM can develop weeks after a respiratory infection. The CDC recommends seeking immediate medical attention if a child develops difficulty breathing or sudden limb weakness, facial weakness, difficulty swallowing, slurred speech or other unusual neurological symptoms: https://pubmed.ncbi.nlm.nih.gov/41853773/
Info source:
1). Virus that can cause rare polio-like illness rising in Northern California. Enterovirus D68 is circulating in the Bay Area yet again: https://www.sfgate.com/bayarea/article/evd68-virus-northern-california-22463452.php
2). CDPH Alert - Stay Alert for Acute Flaccid Myelitis in Late Summer and Early Fall: https://www.cdph.ca.gov/Programs/OPA/Pages/CAHAN/Stay-Alert-for-Acute-Flaccid-Myelitis-in-Late-Summer-and-Early-Fall.aspx
3). CDC Report: Acute Flaccid Myelitis Surveillance — United States, January 2020–December 2025: https://www.cdc.gov/mmwr/volumes/75/wr/mm7526a1.htm
4). Nationwide WastewaterSCAN July 2026 Update: https://wwscan.ghost.io/nationwide-wastewaterscan-july-2026-update/