Human metapneumovirus (hMPV) has probably been infecting people for centuries
ROGER HARRIS/SCIENCE PHOTO LIBRARY
Recent headlines have sparked concerns about a surge in respiratory infections in China due to a virus called human metapneumovirus (hMPV). Contrary to the alarming reports, hMPV is not a new or mysterious virus, and Chinese health authorities have clarified that the situation is not overwhelming their health system.
Understanding Human Metapneumovirus (hMPV)
Human metapneumovirus is a common cold virus that infects the respiratory tract, leading to symptoms like a sore throat, runny nose, coughing, and sneezing. Nearly everyone experiences an hMPV infection by the age of 5, and reinfections can occur throughout life as immunity wanes and new variants emerge.
Assessing the Risk of hMPV
While hMPV typically causes mild symptoms, it can pose a greater risk to vulnerable populations such as young children, the elderly, and individuals with weakened immune systems. Globally, hMPV is estimated to have caused around 11,000 deaths in children under 5 in 2018.
Historical Perspective and Origin
Evidence suggests that hMPV has been circulating in humans for centuries. The virus was first identified in 2001 but has been traced back to samples from as early as 1976. It is believed to have evolved from avian metapneumoviruses around 200 years ago.
Characteristics of hMPV
Belonging to the paramyxovirus group, hMPV has a relatively small genome and shares similarities with other respiratory viruses like measles. Despite ongoing research, there are currently no specific treatments or vaccines for hMPV infections.
Current Situation in China
The recent uptick in hMPV cases in China aligns with seasonal trends of cold and flu infections, which can vary in intensity from year to year. Experts suggest that these fluctuations are part of the normal cycle of respiratory illnesses and do not indicate a crisis.
Preventing a Potential Pandemic
Unlike the novel coronavirus, hMPV is not a new virus, and many individuals already have some level of immunity to it. While reports suggest a new variant of hMPV in China, the virus’s overall impact appears to be less severe than in previous years, mitigating the risk of a widespread pandemic.
