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Glucocorticoid and Pyrazolone Treatment of Acute Fever is a Risk Factor for Critical and Life-Threatening Human Enterovirus 71 Infection During an Outbreak in China, 2008

Ma, HuiLai MPH*; He, Fan MS*; Wan, JunFeng BM†; Jin, DongHui BM*; Zhu, LiYe BM†; Liu, XuXiang BM*; Liu, QiQuan BM†; Zhang, GuoHong BM*; Ding, ZhenTao BM†; Fontaine, Robert E. MD, MSc‡; Zhu, Bao-Ping MD, MS*; Jian, HaiHui BM†; Zhang, LiJie PhD*; Xu, WenBo MD§; Zeng, Guang MS*

Pediatric Infectious Disease Journal: June 2010 - Volume 29 - Issue 6 - pp 524-529
doi: 10.1097/INF.0b013e3181cdd178
Original Studies

Background: Human enterovirus 71 (HEV71) causes outbreaks of life-threatening diseases throughout the world. The genesis of these severe diseases is unknown.

Methods: During an outbreak of HEV71 infection, we investigated risk factors for critical illness. We developed a modified pediatric index of mortality (mPIM) incorporating heart rate, temperature, white blood cell count, respiratory rate, chest infiltrates, skin color, reflexes, responsiveness, and mobility. We calculated the mPIM for 103 patients (22 deaths) using complete scoring criteria in the medical record. In a case–control study, we compared cases (mPIM ≥10 or death) with controls (mPIM = 0–9) by drugs received within 96 hours after onset of fever, initial temperature, age, and nutritional anthropometry.

Results: About 66% (68/103) of the patients with an mPIM score (28 cases and 40 controls) had data on initial exposures. About 50% of the 28 cases and 18% of the 40 controls received an injection to treat fever during the first 96 hours after onset (Odds ratio [OR] = 7.0, 95% confidence interval [CI]: 1.8–28). Injections containing exclusively glucocorticoids (OR = 4.8, 95% CI: 1.2–21) or pyrazolones (OR = 4.1, 95% CI: 0.91–19, P = 0.047) were risk factors for severe HEV71 infection. About 25% of cases and 5% of controls received both drugs parenterally while 7% of cases and 30% of controls received neither (OR = 21, 95% CI: 1.8–305). Conversely, cases and controls had identical average initial temperature, and did not differ significantly by age, sex, nutritional measurements, use of other drugs, or timeliness of medical care received.

Conclusion: Fever treatment with glucocorticoids and/or pyrazolones is a risk factor for life-threatening HEV71 infection.

From the *Chinese Field Epidemiology Training Program, Chinese Center for Disease Control and Prevention, Beijing, China; †Fuyang Center for Disease Control and Prevention, Anhui Province, Fuyang, China; ‡U.S. Centers for Disease Control and Prevention, Atlanta, GA; and §Key Laboratory for Molecular Virology and Genetic Engineering, National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China.

Accepted for publication December 3, 2009.

Address for correspondence: Guang Zeng, MS, Chinese Field Epidemiology Training Program, Chinese Center for Disease Control and Prevention, 27 Nanwei Road, Beijing 100050, China. E-mail:

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© 2010 Lippincott Williams & Wilkins, Inc.