Everything you need to know about HMPV and its recent surge

What is Human Metapneumovirus (HMPV)?

Human Metapneumovirus (HMPV) is a respiratory virus that shares similarities with the common cold or flu. Symptoms typically include coughing, runny nose, fever, and sore throat, but it can also lead to more severe complications like bronchitis and pneumonia, particularly in vulnerable groups such as young children, the elderly, and those with compromised immune systems.

HMPV is part of the Pneumoviridae family, which also includes the Respiratory Syncytial Virus (RSV). The virus was first discovered in 2001 in the Netherlands. Outbreaks tend to occur during the colder months, when respiratory infections are more common.

Why is HMPV Making Headlines Now?

There has been a noticeable rise in HMPV cases across northern China, especially among children, leading to concerns about the potential for a widespread outbreak. While local health authorities have acknowledged the surge, they have also downplayed the severity of the situation. China’s Centre for Disease Control (CDC) attributes the increase to the usual winter uptick in respiratory infections and assures the public that hospitals are not overwhelmed.

“Respiratory infections are common during the winter season, and this year’s cases appear less severe than those from the previous year,” Mao Ning, a spokesperson for China’s foreign ministry told media.

Experts believe that part of the reason for the apparent increase in cases is improved diagnostic methods, which allow for easier identification of HMPV, as heightened awareness from the Covid-19 pandemic has made people more alert to such outbreaks, sometimes giving the impression that the situation is more dire than it actually is.

How Serious is HMPV?

For most people, HMPV causes mild illness, similar to a cold or flu, which usually resolves with rest and self-care. However, the virus can cause more serious complications in vulnerable populations—especially the elderly, young children, and those with weakened immune systems.

In these groups, HMPV may lead to pneumonia, bronchitis, or exacerbate existing conditions like asthma. While HMPV is not a new virus, its ability to cause serious illness in certain individuals makes it noteworthy.

Who is Most at Risk?

The individuals most likely to experience severe illness from HMPV include:

• Children under five, particularly infants.
• Older adults, especially those over the age of 65.
• People with compromised immune systems or chronic respiratory conditions like asthma or COPD.

In these groups, the virus can lead to severe complications such as bronchitis or pneumonia. For the majority of people, however, the symptoms are relatively mild and self-limiting.

How is HMPV Transmitted?

HMPV spreads primarily through respiratory droplets from coughing or sneezing. It can also be transmitted through close contact (e.g., shaking hands) or by touching contaminated surfaces and then touching your mouth, nose, or eyes. Like many respiratory viruses, HMPV is more likely to spread during the winter months, when people are in closer proximity to each other indoors.

Should We Be Concerned About HMPV?

Although the recent surge in cases has raised alarm, experts stress that HMPV is not a pandemic-level threat. Unlike Covid-19, which was caused by a novel virus, HMPV has been circulating for decades, and many people have some level of immunity from previous infections. Therefore, it’s unlikely that it will cause the same widespread devastation as the Covid-19 pandemic.

How Does HMPV Compare to Covid-19?

Although both HMPV and Covid-19 cause respiratory symptoms, there are important differences between the two viruses:

• HMPV is a virus that has been around for decades, meaning many people already have some level of immunity from previous infections. It is a seasonal virus that typically causes mild symptoms and is not a novel virus like Covid-19.
• Covid-19, in contrast, was caused by a new virus that led to a global pandemic, primarily because humans had no pre-existing immunity to it.

While both viruses can cause severe respiratory illness, HMPV does not carry the same pandemic potential as Covid-19, and the global population has built some immunity to it over time.

When Should You Seek Medical Help?

You should contact a healthcare provider if:

• Your symptoms worsen after a few days.
• You experience difficulty breathing or bluish skin.
• You have a chronic respiratory condition like asthma or COPD and the symptoms are getting worse.

Most people will recover from HMPV with rest, hydration, and over-the-counter medications to manage pain and fever. Severe cases may require hospitalization for treatments such as oxygen therapy or intravenous fluids.