What you need to know about HMPV as China sees rise in cases

Chinese health officials are reportedly monitoring an increase in cases of human metapneumovirus (HMPV). There is currently no evidence that the outbreak is out of the ordinary or that a new respiratory virus or illness has emerged in China. HMPV is a virus that can cause upper and lower respiratory disease, according to the CDC. It was discovered in 2001 and is in the Pneumoviridae family along with respiratory syncytial virus, or RSV, the CDC said.

A spokesperson for the World Health Organization (WHO) said data from China indicates "there has been a recent rise in acute respiratory infections" but that "the overall scale and intensity of respiratory infectious diseases in China this year are lower than last year."

Cases of HMPV have been steadily increasing in the U.S. since November 2024 with 1.94% of weekly tests positive for HMPV as of Dec. 28, 2024, according to data from the Centers for Disease Control and Prevention (CDC). By comparison, 18.71% of weekly tests were positive for flu and 7.10% were positive for COVID during the same week, the data shows.

Public health experts told ABC News that HMPV is well-known to health care professionals and commonly circulates during respiratory virus season.

MORE: Cases of RSV, flu ticking up among young children in US as respiratory virus season begins
"This is that winter respiratory virus season, indeed," Dr. William Schaffner, a professor of preventive medicine at Vanderbilt University Medical Center in Nashville, told ABC News. "So, all of these respiratory viruses -- influenza, COVID, RSV, human metapneumovirus -- they all increase this time of the year, in part because we get so close to each other."

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Source: ABC News, 7 January 2025