Clinical characteristics of hospitalized severe acute respiratory illnesses in adults and risk factors of severe illness: results of sentinel surveillance in 10 provinces, China
JIANG Hui1, *, YU De-shan2, RUAN Feng3, XU Wen4, HUANG Ting5, LI Ling6, WANG Kai-li7, LIU She-lan8, ZHANG Heng-jiao9, JIA Ping-dong10, YANG Peng11, PENG Zhi-bin1, ZHENG Jian-dong1, FENG Lu-zhao1, YU Hong-jie1
*Key Laboratory of Surveillance and Early-warning on Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing 102206, China.
Abstract:ObjectiveTo understand clinical characteristics and demographics of hospitalized severe acute respiratory illnesses (SARI) patients in adults and to analyze risk factors associated with severe cases and death. MethodsEpidemiological surveys were conducted among SARI adult (≥15 years old) cases registered by sentinel surveillance sites in 10 provinces from December 2009 to June 2014, and their respiratory specimen were collected for influenza virus nucleic acid test. All enrolled cases were divided into two groups of hospitalized severe cases and mild cases, and the demographic, clinical, and epidemiological characteristics were compared. In addition, risk factors of severe illness were analyzed. ResultsAmong 3071 SARI patients registered by surveillance sites in 10 provinces from December, 2009 to June, 2014, the median age was 58 years, and 39.69% were over 65-year-old. 2639 (85.93%) had mild illnesses, 432 (14.07%) patients were severe cases. Male, patients over 65-year-old, pregnant women and patients with chronic medical conditions were more susceptible to severe SARI. Fever (96.44%) and cough (85.47%) were two most prevalent clinical symptoms. One third cases had complication. 5.95% SARI patients used antiviral drugs after onset. 240(7.82%) were influenza cases, and most of them were A(H1N1)pdm and A(H3N2) subtypes. Logistic regression suggested that male, chronic medical conditions and delay over 7 days from onset to hospital admission were the risk factors for severe illness; pneumonia was the risk factor for death. ConclusionsSARI cases are mainly male and ≥65 years old. The usage of antiviral drugs are limited in the influenza cases. We recommend hospitalized influenza patients should use antiviral drugs as soon as possible. The main pathogens causing SARI are not known, we recommend respiratory pathogens should be tested.
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