| human metapneumovirus associated with respiratory tract infections in a 3-year study of nasal swabs from infants in italy. | the newly described human metapneumovirus (hmpv) is reported here to be more commonly associated with lower respiratory tract disease. the present study examined nasal swab specimens from 90 infants with acute respiratory tract infections in pisa, italy, over a period of three respiratory virus seasons. the incidence of infection varied in each of the 3 years, with the rates of positivity for hmpv being 7% in 2001 but 37 and 43% in 2000 and 2002, respectively. hmpv was noted to occur seasonally ... | 2003 | 12843031 |