Cytomegalovirus infection and wheezing in infants

Background: Bronchial asthma‐like symptoms such as wheezing are commonly associated with respiratory tract infection including respiratory syncytial virus (RSV) infection in infants. No study on the association of wheezing with cytomegalovirus (CMV) infection in infancy has been reported, although CMV infection has been observed to play some role in prolonged and intractable wheezing in limited cases. Methods: The present study investigated 40 hospitalized infants who presented with first‐episode wheezing between October 2003 and September 2004. Nasopharyngeal aspirates were tested for RSV, and serum antibodies against CMV were measured. As controls, age‐matched infants with no wheezing were examined for CMV serostatus. Results: RSV‐antigen was detected in 21 subjects (53%), and seven (18%) were considered primary CMV infection serologically. Primary CMV infection was found more often in the wheezers than in the controls although the difference was not statistically significant (P = 0.06). The incidence of splenomegaly was significantly higher in wheezers with CMV infection (86%) than in those with RSV infection or without either infection. The duration of wheezing, fever, and radiographic and laboratory findings during hospitalization were not significantly different. Conclusions: CMV infection based on serologic diagnosis should be considered in infants with first wheezing episode and particularly those with splenomegaly.