Etiological characteristics of influenza A (H1N1) 2009 virus in Beijing / 中华流行病学杂志
Chinese Journal of Epidemiology
; (12): 494-496, 2010.
Article
in Zh
| WPRIM
| ID: wpr-277750
Responsible library:
WPRO
ABSTRACT
Objective To analyze the results of detection on influenza A (H1N1) 2009 virus in Beijing from May 2009 to December 2009 and to understand the epidemiologic characteristics during the pandemic period. Methods The study was conducted from the May 1 to December 27,2009. A total of 101 852 throat swab samples were detected with the real-time RT-PCR assay by the Beijing Network Laboratory. Data was statistically analyzed. Results 9843 samples showed influenza A (H1N1) 2009 positive, with an overall positive rate as 9.66%. In terms of the positive rates, they were 2.85% from May to June, 3.32% from July to August and 8.35% from September to October. The peak month fell in November (29.67%) and December (24.33%). The positive rates among the following subpopulations were: 8.40% among the suspected cases, 4.75% among close contact cases, 11.46% among the influenza-like illness cases and 7.33% among the cluster cases with fever. Positive cases mainly fell in age groups 5-14 and 15-24. The ratio of male to female was 1.5:1.Conclusion During the pandemic period of influenza A (H1N1) 2009, positive cases gradually increased during May to November but slowly decreasing in December.
Full text:
1
Index:
WPRIM
Type of study:
Etiology_studies
Language:
Zh
Journal:
Chinese Journal of Epidemiology
Year:
2010
Type:
Article