Clinical features of influenza A and B in children and association with myositis

J Microbiol Immunol Infect 2004;37:95-98.
 
Jen-Jan Hu1, Chuan-Liang Kao2, Ping-Ing Lee3, Chung-Ming Chen3, Chin-Yun Lee3, Chun-Yi Lu3, Li-Min Huang3
1Department of Pediatrics, Taiwan Adventist Hospital, Taipei; and Departments of 2Laboratory Medicine and 3Pediatrics, National Taiwan University Hospital, Taipei, Taiwan, ROC

Received: May 1, 2003 Revised: June 3, 2003 Accepted: July 14, 2003

Corresponding author: Dr. Li-Min Huang, Division of Infectious Diseases, Department of Pediatrics, National Taiwan University Hospital, No. 7, Chung-Shan South Road, Taipei, Taiwan 100, ROC. E-mail: lmhuang@ha.mc.ntu.edu.tw This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Influenza virus is among the most common causes of respiratory illness, which may manifest as a range of conditions, from mild upper respiratory tract infection to bronchiolitis and pneumonia. Acute childhood myositis associated with influenza occurs mostly in influenza B infection. In this retrospective study, we analyzed the characteristics of 197 children with influenza virus treated from January 2000 to December 2001. Among them, 73 children had influenza A infection and 124 had influenza B infection. Influenza A virus outbreaks occurred in January 2000, July 2001, and December 2001, while influenza B virus outbreaks occurred from March 2000 to May 2000 and from December 2000 to February 2001. The most common clinical manifestations of influenza A and influenza B virus infection included fever, cough, and rhinorrhea. These infections also frequently manifested as laryngo-tracheobronchitis, pneumonia, and unexplained fever, which led to hospitalization. The most common clinical diagnosis was upper respiratory tract infection. The rates of benign acute childhood myositis in influenza A and influenza B were 5.5% and 33.9%, respectively. Creatine kinase levels were elevated in most myositis cases and boys were more commonly affected. Acute childhood myositis was more commonly seen in influenza B infection.

Key words: Child, influenza, myositis

J Microbiol Immunol Infect 2004;37:95-98.

 

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