Investigation on a seasonal influenza accompanying with the first locale novel A/H1N1 influenza outbreak in China.
- Author:
Jun YUAN
1
;
Mei-xia LI
;
Yu-fei LIU
;
Biao DI
;
Xiao-ling XIAO
;
Xin-wu MAO
;
Ye-jian WU
;
Hua-ping XIE
;
Zhao-jun XIE
;
Hao ZHANG
;
Jian-ping LIU
;
Hai-lin LI
;
Ji-chuan SHEN
;
Zhi-cong YANG
;
Ming WANG
Author Information
- Publication Type:Journal Article
- MeSH: Adolescent; Adult; China; epidemiology; Community-Acquired Infections; epidemiology; Disease Outbreaks; Female; Humans; Influenza A Virus, H1N1 Subtype; Influenza, Human; epidemiology; Male; Middle Aged; Young Adult
- From: Chinese Journal of Preventive Medicine 2009;43(10):852-855
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo timely summarize past experience and to provide more pertinent reference for control and prevention in A/H1N1 cases in influenza season.
METHODSDuring May 25 to 31, 2009, 2 secondary community cases caused by a influenza A/H1N1 imported case. In the close contacts of 3 A/H1N1 cases, 14 had some aspirator symptoms onset, such as fever (> or = 37.5 degrees C), cough, sore throat and etc. Laboratory tests excluded the infection of A/H1N1 influenza. For throat swab test for the 14 cases, 7 were tested for seasonal influenza virus. A face-to-face or telephone interview was conducted by CDC staff to collect information of 62 close contacts.
RESULTSOf 14 fever cases, there was no significant by differences by age[15-age group: 19.2% (5/26), over 25-age group: 25.0% (9/36); chi(2) = 0.287, P = 0.592]; by sex group [24.0% (6/25) for male and 21.6% (8/37) for female; chi(2) = 0.048, P = 0.826], by working units [dressing and design, photograph, saleroom and others, consumer group: 42.1% (8/19), 27.3% (3/11), 12.5% (2/16) and 6.3% (1/16); chi(2) = 7.653, P = 0.054], by dormitory style [dormitory style = 33.3% (4/12), non-dormitory style = 29.4% (10/34); chi(2) = 0.699, P = 0.403]. All the cases had fever (37.5 - 37.9 degrees C), no case had diarrhea. One in 3 A/H1N1 cases had diarrhea. All the 14 cases were negative result for A/H1N1 RNA. Six from 7 cases were positive for seasonal influenza test.
CONCLUSIONThis was a seasonal influenza outbreak happened in the close contacts of first confirmed A/H1N1 cases in community in mainland China. It showed that we should exclude the seasonal influenza in the investigation of A/H1N1 cases in the seasonal influenza period in some time. It is necessary to take effective measure to strengthen the control and prevention of seasonal influenza.