Human Metapneumovirus (HMPV) Spreading in California: What to Know
Across California, particularly in Northern regions, a surge in respiratory illnesses is being attributed to a virus many haven’t heard of: human metapneumovirus (HMPV). While symptoms often mirror those of COVID-19 and the flu, HMPV is distinct and currently lacks a vaccine or specific antiviral treatment.
What is Human Metapneumovirus (HMPV)?
Human metapneumovirus is a common respiratory virus that can affect people of all ages, causing both upper and lower respiratory tract infections Centers for Disease Control and Prevention. It belongs to the same virus family as respiratory syncytial virus (RSV).
Is HMPV Spreading in Northern California?
Surveillance data and wastewater monitoring indicate widespread HMPV activity in parts of Northern California, including San Francisco, Sacramento, Davis, and Vallejo San Francisco Chronicle. Wastewater testing serves as an early indicator of viral spread within communities, even among those not seeking clinical testing SFGate.
Why the Increased Attention Now?
While HMPV has circulated for decades, it’s receiving more attention due to increased public awareness of respiratory viruses following the COVID-19 pandemic USA Today. Its symptoms are often similar to other respiratory infections, leading to many cases going undiagnosed.
Symptoms of HMPV
Common symptoms include:
- Cough
- Fever
- Nasal congestion
In some cases, particularly in vulnerable individuals, HMPV can lead to bronchitis or pneumonia Centers for Disease Control and Prevention.
Who is at Higher Risk?
While most HMPV infections are mild, certain groups are at increased risk of severe illness:
- Infants and children younger than 2 years old
- Individuals with weakened immune systems
- People with underlying lung or heart conditions
How Does HMPV Spread?
HMPV spreads through similar routes as other respiratory viruses:
- Respiratory droplets produced by coughing or sneezing
- Close personal contact (touching, shaking hands)
- Contact with contaminated surfaces followed by touching the face
Treatment and Prevention
Currently, there is no vaccine or specific antiviral treatment for HMPV Centers for Disease Control and Prevention. Treatment focuses on supportive care, such as rest and fluids.
Preventive measures include:
- Frequently cleaning frequently touched surfaces
- Improving ventilation in indoor spaces
When to Seek Medical Attention
UC Davis Health recommends consulting a doctor if symptoms are severe or unusual Hoodline. Warning signs include:
- Symptoms lasting longer than 10 days
- Fever or lethargy in infants younger than 3 months