Analysis of influenza surveillance results in Jingzhou， Hubei Province from 2016 to 2021 / 上海预防医学

ObjectiveTo understand the epidemiological characteristics of influenza in Jingzhou from 2016 to 2021， so as to provide scientific evidence for the formulation of influenza prevention and control policies in this region， and effectively protect people's health. MethodsData of influenza-like illness （ILI） and pathogen surveillance in Jingzhou during 2016‒2021 were collected and statistically analyzed. ResultsA total of 46 272 ILI cases were reported from two hospitals in Jingzhou City from 2016 to 2021. The difference in the constituent ratio of ILI was statistically significant among different age groups （P<0.05）. A total of 12 812 specimens were collected from two hospitals for influenza surveillance. A total of 1 513 cases were RNA positive，and the positive rate of influenza virus nucleic acid detection was 11.81％. The RNA positive specimens were mainly B （Victoria）， accounting for 39.33％. There were statistically significant differences in the positive rate of influenza virus nucleic acids and different types of influenza virus nucleic acids among different years （P<0.05）. ConclusionThe influenza epidemic in Jingzhou peaks in winter and spring， and the new A （H1），A （H3）， B （Victoria） and B （Yamagata） types alternate and mixed epidemics dominate.

Analysis on Surveillance of Influenza in Tianshui Prefecture from 2005 to 2008 / 中国疫苗和免疫

Objective To observe epidemic status and the types of the influenza virus, to analyse influenza epidemic trends in Tianshui City, and to provide basis for influenza prevention and control. Methods Throat swab specimens of influenza cases in pilot hospitals and area of influenza-like a typical outbreak in Nov. 2005-Oct. 2008 was tested by chicken embryo and MDCK cells.The identifi cation of the isolates was carried out by hemagglutination and hemagglutination inhibition test. The separation of strains were sent to the National Influenza Center to conduct a review appraisal. Results 1819 throat swab specimens of influenza-like were collected and 247 were isolated. Isolation rate was 13.58%. There were 36 strains (14.57%) of A (H1N1) subtype, 75 strains (30.36%) of A (H3N2) subtype and 136 (Victoria department 121, Yamagata department 15) strain (55.06%) of B subtype. Conclusion There were three epidemic types of influenza virus types-A (H1N1), A (H3N2) and B in Tianshui. Virus were epidemic at the same time or alternating at different intensity in different years. Outbreaks of influenza have occurred in rural primary and secondary schools, and B subtype was dominating.