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Uirusu. 2006 Dec;56(2):173-81.

[Human metapneumovirus].

[Article in Japanese]

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Touei Hospital, Pediatric Clinic, Higashi-ku, Sapporo.


Human metapneumovirus (hMPV), first isolated in the Netherlands in 2001, is a member of the genus Metapneumovirus of the sub-family Pneumovirinae of the family Paramyxoviridae. The genomic organization of hMPV is 3'-N-P-M-F-M2-SH-G-L-5'. hMPV resembles the sole member of this genus, avian pneumovirus. hMPV is the most closely related human pathogen to respiratory syncytial virus. Phylogenetic analysis of the nucleotide sequences indicated that there were two genetic groups. Furthermore, each group could be subdivided into two subgroups. hMPV encodes three surface proteins, F, G and SH proteins. The majority of antibodies to hMPV in serum were antibody against F protein, which mediates cross-group neutralization and protection. The incidences of hMPV-associated respiratory infection estimate 5 to 10% in children and 2 to 4% in adults. hMPV generally causes upper respiratory tract infection and flu-like illness, the virus can be associated with lower tract infections, such as wheezy bronchitis, bronchitis, bronchiolitis and pneumonia, in very young children, elderly persons, and immunocompromised patients. hMPV has a seasonal peak during the spring in Japan. Reinfection with hMPV frequently occurs in children, implying that the host immune response induced by natural infection provides incomplete protection. The RT-PCR test is the most sensitive test for detection of hMPV.

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