Sigurs and colleagues reported that 43% of infants with RSV bronchiolitis resulting in hospitalization had asthma or recurrent wheeze, with recurrent wheeze defined as three or more episodes of wheezing not verified by a physician in the prior year, at the age of 13, compared with 8% of control subjects (24) . hMPV hMPV, a recently isolated virus, is a paramyxovirus that is closely related to RSV by phylogenetic analysis and causes respiratory tract infections in both children and adults (25) . hMPV was isolated from children in 2001, and hMPV is associated with asthma exacerbations in both children and adults (25) (26) (27) (28) .