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• W2374911149 abstract "Objective To study the epidemiological characteristics of cases with influenza A(H1N1)infection in Changsha in 2009, to describe the epidemic process of influenza A(H1N1), to evaluate the change of the effective regeneration rate of Changsha, and to provide the scientific evidence for control and prevention of influenza A (H1N1). Methods The epidemiological characteristics of 5,439 cases with influenza A(H1N1)reported in Changsha in 2009 were descriptively analyzed, including the distribution of age, sex and occupation. The change of the effective regeneration rate of R(t) in Changsha was calculated by program in Matlab. The situations of 5,439 cases with influenza A (H1N1) in the geographical distribution and the incidence rate of each district or county in Changsha were described. Results Of all the cases with influenza A (H1N1) in Changsha, male cases accounted for 59% and female ones accounted for 41%. 92.8% of the cases concentrated in the age range of 0 to 20 years. Most of the cases fell into the age group of 11～20 years, accounted for 63.7%. The occupational proportion showed that the majority of the cases were students, accounting for 90.4% of the total. The period from the onset to diagnosis in all cases was an average of 3 ± 2 days. The peak of influenza A (H1N1) in Changsha appeared in mid-November 2009. From September 1 to November 19, the influenza A (H1N1) cases in Changsha could be divided into four stages. The days from October 8 to November 19 were the period when the influenza A (H1N1) cases accelerated to the peak. The effective regeneration rate of R(t) became the highest on September 1 when schools opened and on October 8 when the holidays about the National Day ended. In terms of geographical distribution, the cases occurred in all the five districts, three counties, and one city, in which the number of the cases in Liuyang was the largest, with the highest incidence rate being about 22.97/10,000, and the number of the cases in Ningxiang County was the least, with the lowest incidence rate being about 1.26 /10,000. Conclusions Male patients with influenza A (H1N1) were significantly more than female ones in Changsha. The students accounted for 90.4% of the total cases, and therefore they were the risk population for influenza A (H1N1). Prevention and control of influenza A (H1N1) should be focused on schools." @default.
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• W2374911149 date "2010-01-01" @default.
• W2374911149 modified "2023-09-23" @default.
• W2374911149 title "Epidemiological Characteristics of Cases of Influenza A(H1N1) Infection in Changsha in 2009" @default.
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