All issues > Volume 52(3); 2009

Original Article

Korean J Pediatr. 2009;52(3):330-338. Published online March 15, 2009.

Epidemiologic and clinical features in children with acute lower respiratory tract infection caused by human metapneumovirus in 2006-2007

Gwi Ok GO Park¹, Ji Hyun JH Kim¹, Jae Hee JH Lee¹, Jung Ju JJ Lee¹, Sin Weon SW Yun¹, In Seok IS Lim¹, Dong Keun DK Lee¹, Eung Sang ES Choi¹, Byoung Hoon BH Yoo,¹, Mi Kyung MK Lee², Soo Ahn SA Chae¹

¹Departments of Pediatrics, College of Medicine, Chung Ang University, Seoul, Korea
²Departments of Laboratory Medicine, College of Medicine, Chung Ang University, Seoul, Korea

Correspondence Soo Ahn SA Chae ,Email: kidbrain@korea.com

Abstract

Purpose
: The causes of acute lower respiratory tract infection (ALRTI) are mostly attributable to viral infection, including respiratory syncytial virus (RSV), parainfluenza virus (PIV), influenza virus A/B (IFV A/B), or adenovirus (ADV). Several Korean studies reported human metapneumovirus (hMPV) as a common pathogen of ALRTI. However, studies on seasonal distribution and clinical differences relative to other viruses are insufficient, prompting us to perform this study.
Methods
: From November 2006 to October 2007, we tested nasopharyngeal aspiration specimens in children hospitalized with ALRTI with the multiplex reverse transcriptase-polymerase chain reaction to identify 6 kinds of common pathogen (hMPV, RSV, PIV, IFV A/B, and ADV). We analyzed positive rates and clinical features by respiratory chart review.
Results
: We detected 38 (8.4%) hMPV-positive cases out of 193 (41.8%) virus-positive specimens among 462 patients. HMPV infection prevailed from March to June with incidence peaking in April. HMPV-positive patients were aged 15 years (76.3%), and the ratio of boys to girls was 1.2:1. The median age was 27 months. HMPV primarily caused pneumonia (76.3 %) (P=0.018). Average hospitalization of HMPV-associated ALRTI patients was 5.8 days. In addition, they showed parahilar peribronchial infiltration (100%) on chest X-ray, normal white blood cell count (73.7%), and negative C-reactive protein (86.8 %) (P>0.05). All hMPV-positive patients recovered without complication.
Conclusion
: HMPV is a common pathogen of ALRTI in Korean children, especially in 1-5 year olds, from March to May. Immunocompetent children diagnosed with hMPV-associated ALRTI may have a good prognosis.

Keywords :Human metapneumovirus, Respiratory infections, Children