Surveillance of viral etiology of acute lower respiratory tract infection in 0-2 years old infant

Objective To investigate the viral pathogens of respiratory infections in 0- 2 years old infants of and clinical features of different viruses,and to conduce clinical diagnosis. Methods Totally infant diagnoses of respiratory infections during the period of 2011. 10 to 2013. 9 were recruited into this study. These patients were hospitalized patients in department of internal medicine. One Nasopharyngeal aspirates specimen was collected from each patient. Fluor immunifaction methods were applied to detect common respiratory viruses including respiratory syncytial virus( RSV),influenza virus type A,B,parainfluenza virus( PIV) type 1- 3,adenovirus( ADV). Results The total positive rate of viruses was 25. 40%. The top virus was RSV( 55. 03%),the epidemic months of RSV were January-February and September-December,the second one was PIV-3( 17. 24%) whose epidemic months were from May-August and the IV-A( 10. 06%) were from March-May. The top virus in groups of 0-3 months' infants was RSV( 22. 84%),and in groups of 1- 2 years' infant was IV-A( 3. 82%) and the adenovirus infection was( 3. 73%). RSV can cause pneumonia and bronchiolitis whose clinical manifestations were cough and asthma. Influenza virus type A and adenovirus can cause upper respiratory infections whose clinical manifestation was high fever. Conclusion Virus was the main athogens in 0- 2 years' infants with respiratory infections. Different viral infections had different seasonal features,which can conduce to clinical diagnosis.