Rising HMPV Cases Across the US: What You Need to Know

As the winter and spring seasons progress, a respiratory virus is gaining traction across several states, prompting health alerts and increased medical consultations. Human metapneumovirus (HMPV), a common cause of respiratory illness, is experiencing a rise in cases, particularly in California and New Jersey. Here’s a breakdown of what you need to know about HMPV, its symptoms, and how to protect yourself.

What is HMPV?

Human metapneumovirus (HMPV) was first identified in 2001. The Centers for Disease Control and Prevention (CDC) classifies it as a common cause of upper and lower respiratory tract infections. It belongs to the Pneumoviridae family, the same family as respiratory syncytial virus (RSV). While not a new virus, its seasonal spread was disrupted by the COVID-19 pandemic, and its resurgence signals a return to pre-pandemic respiratory disease patterns.

Where are Cases Increasing?

Recent data indicates an increase in HMPV cases in several regions. California is currently experiencing high concentrations of HMPV, detected in wastewater in communities like Novato, Sunnyvale, and Merced. New Jersey is also reporting a significant rise in cases, contributing to increased demand for emergency medical care alongside RSV, influenza, and COVID-19. Wastewater surveillance through the WastewaterScan Dashboard confirms elevated levels in Northern California. Nationally, HMPV levels are also tracking higher along the Northeast coast.

What are the Symptoms of HMPV?

HMPV symptoms are similar to those of a common cold, including:

• Cough
• Nasal congestion
• Fever
• Shortness of breath

In some cases, HMPV can lead to more severe conditions like bronchitis or pneumonia, particularly in vulnerable populations.

Who is at Risk?

While most people recover from HMPV without intensive medical intervention, certain groups are at higher risk of severe illness:

• Young children (under five years aged)
• Older adults (over 65 years old)
• Individuals with chronic diseases

Is There a Vaccine or Treatment?

Currently, there is no vaccine to prevent HMPV infection, nor is there a specific antiviral treatment available. Medical care focuses on supportive measures, such as symptom management and ensuring adequate hydration. In severe cases, supplemental oxygen may be required.

How Can You Protect Yourself?

Preventing the spread of HMPV relies on practicing good hygiene:

• Wash your hands frequently and thoroughly.
• Avoid touching your eyes, nose, and mouth with unwashed hands.
• Reduce close contact with individuals exhibiting respiratory symptoms.
• Clean and disinfect frequently touched surfaces.
• Improve ventilation in indoor spaces.
• Cover your mouth and nose when coughing or sneezing.

Looking Ahead

Health officials are continuing to monitor HMPV circulation and provide updates as the situation evolves. While the increase in cases is concerning, experts emphasize the importance of preventative measures and seeking medical attention if you experience persistent or severe symptoms. The CDC and state health departments will continue to provide information and guidance on HMPV and other respiratory viruses.