Human Metapneumovirus and Lower Respiratory Tract Disease in Otherwise Healthy Infants and Children
John V. Williams, M.D., Paul A. Harris, Ph.D., Sharon J. Tollefson, B.A., Lisa L. Halburnt-Rush, M.Ed., Joyce M. Pingsterhaus, B.A., Kathryn M. Edwards, M.D., Peter F. Wright, M.D., and James E. Crowe, Jr., M.D.
Background We sought to determine the role of human metapneumovirusin lower respiratory tract illness in previously healthy infantsand children.
Methods We tested nasal-wash specimens, obtained over a 25-yearperiod from otherwise healthy children presenting with acuterespiratory tract illness, for human metapneumovirus.
Results A viral cause other than human metapneumovirus was determinedfor 279 of 687 visits for acute lower respiratory tract illness(41 percent) by 463 children in a population of 2009 infantsand children prospectively seen from 1976 to 2001. There were408 visits for lower respiratory tract illness by 321 childrenfor which no cause was identified. Of these 321 children, specimensfrom 248 were available. Forty-nine of these 248 specimens (20percent) contained human metapneumovirus RNA or viable virus.Thus, 20 percent of all previously virus-negative lower respiratorytract illnesses were attributable to human metapneumovirus,which means that 12 percent of all lower respiratory tract illnessesin this cohort were most likely due to this virus. The meanage of human metapneumovirusinfected children was 11.6months, the male:female ratio was 1.8:1, 78 percent of illnessesoccurred between December and April, and the hospitalizationrate was 2 percent. The virus was associated with bronchiolitisin 59 percent of cases, pneumonia in 8 percent, croup in 18percent, and an exacerbation of asthma in 14 percent. We alsodetected human metapneumovirus in 15 percent of samples from261 patients with upper respiratory tract infection but in only1 of 86 samples from asymptomatic children.
Conclusions Human metapneumovirus infection is a leading causeof respiratory tract infection in the first years of life, witha spectrum of disease similar to that of respiratory syncytialvirus.
Source Information
From the Division of Infectious Diseases, Departments of Pediatrics (J.V.W., S.J.T., L.L.H.-R., J.M.P., K.M.E., P.F.W., J.E.C.), Biomedical Engineering (P.A.H.), and Microbiology and Immunology (P.F.W., J.E.C.), Vanderbilt University Medical Center, Nashville.
Address reprint requests to Dr. Crowe at Vanderbilt University Medical Center, D-7235 Medical Center N., 1161 21st Ave. S., Nashville, TN 37232-2581, or at james.crowe{at}vanderbilt.edu.
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