Human metapneumovirus (HMPV or hMPV) is a negative-sense single-stranded RNA virus of the family Pneumoviridae and is closely related to the Avian metapneumovirus (AMPV) subgroup C. It was isolated for the first time in 2001 in the Netherlands by using the RAP-PCR (RNA arbitrarily primed PCR) technique for identification of unknown viruses growing in cultured cells. It is the second most common cause after respiratory syncytial virus (RSV) of lower respiratory infection in young children. The peak age of hospitalization for infants with HMPV occurs between 6–12 months of age, slightly older than the peak of RSV, which is around 2–3 months. The clinical features and severity of HMPV are similar to those of RSV. HMPV is also an important cause of disease in older adults. Human metapneumovirus was first discovered in 2001 in the Netherlands by Bernadette G. van den Hoogen and her colleagues. hMPV was first detected in the respiratory secretions of 28 young children in the Netherlands and had initially stood out from other common respiratory viruses because the testing methods van den Hoogen et al. had tried using (immunological assays using virus-specific antibodies and PCR-based methods using virus genome-specific primers) were only able to test for known respiratory viruses and, therefore, were unable to identify the novel virus. It was not until researchers began applying molecular biology techniques that the genetic characteristics and portions of the genomic sequences of the virus could be identified; these techniques included the randomly primed PCR technique which obtained the limited sequence data needed to reveal a clear relationship between this new virus and the avian pneumovirus. It was this close relationship to AMPV that gave rise to this new virus being named human metapneumovirus to reflect both its identity as a metapneumovirus and its use of humans as a host organism. HMPV is associated with 5% to 40% of respiratory tract infections in hospitalized and outpatient children.

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