tetano
Editor, Senior Moderator
Vaccines (Basel). 2020 Mar 1;8(1). pii: E108. doi: 10.3390/vaccines8010108. [h=1]Characteristics of Seasonal Influenza Virus Activity in a Subtropical City in China, 2013-2019.[/h]
Zhu A[SUP]1[/SUP], Liu J[SUP]2[/SUP], Ye C[SUP]3[/SUP], Yu J[SUP]1[/SUP], Peng Z[SUP]1[/SUP], Feng L[SUP]1[/SUP], Wang L[SUP]1[/SUP], Qin Y[SUP]1[/SUP], Zheng Y[SUP]1[/SUP], Li Z[SUP]1[/SUP].
[h=3]Author information[/h]
[h=3]Abstract[/h] [h=4]BACKGROUND:[/h] To optimize seasonal influenza vaccination programs in regions with potentially complicated seasonal patterns, the epidemiological characteristics of seasonal influenza activity in a subtropical city of China were explored.
[h=4]MATERIALS AND METHODS:[/h] Influenza virus data of patients with influenza-like illness (ILI) during 2013-2019 were collected from two sentinel hospitals in a subtropical region of China, Yichang city. The influenza virus positive rate among sampled ILI cases served as a proxy to estimate influenza seasonal characteristics, including periodicity, duration, peaks, and predominant subtypes/lineages. Epidemiological features of different years, seasons and age groups were analyzed, and vaccine mismatches were identified.
[h=4]RESULTS:[/h] In total, 8693 ILI cases were included; 1439 (16.6%) were laboratory-confirmed influenza cases. The influenza A positive rate (10.6%) was higher than the influenza B positive rate (5.9%). There were three influenza circulation patterns in Yichang: (1) annual periodicity (in 2013-2014, 2015-2016 and 2018-2019), (2) semiannual periodicity (in 2014-2015), and (3) year-round periodicity (in 2016-2017 and 2017-2018). Summer epidemics existed in two of the six years and were dominated by influenza A/H3N2. Winter and spring epidemics occurred in five of the six years, and A/H1N1, A/H3N2, B/Victoria, and B/Yamagata were codominant. During the study period, the predominant lineages, B/Victoria in 2015-16 and B/Yamagata in 2017-2018, were both mismatched with the influenza B component of the trivalent vaccine. Children 5-14 years old (26.4%) and individuals over 60 years old (16.9%) had the highest influenza positive rates.
[h=4]CONCLUSIONS:[/h] The seasonal epidemic period and the predominant subtype/lineage of influenza viruses in Yichang city are complex. Influenza vaccination timing and strategies need to be optimized according to the local features of influenza virus activity.
[h=4]KEYWORDS:[/h] influenza; seasonality; subtropical city
PMID: 32121519 DOI: 10.3390/vaccines8010108
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Zhu A[SUP]1[/SUP], Liu J[SUP]2[/SUP], Ye C[SUP]3[/SUP], Yu J[SUP]1[/SUP], Peng Z[SUP]1[/SUP], Feng L[SUP]1[/SUP], Wang L[SUP]1[/SUP], Qin Y[SUP]1[/SUP], Zheng Y[SUP]1[/SUP], Li Z[SUP]1[/SUP].
[h=3]Author information[/h]
[h=3]Abstract[/h] [h=4]BACKGROUND:[/h] To optimize seasonal influenza vaccination programs in regions with potentially complicated seasonal patterns, the epidemiological characteristics of seasonal influenza activity in a subtropical city of China were explored.
[h=4]MATERIALS AND METHODS:[/h] Influenza virus data of patients with influenza-like illness (ILI) during 2013-2019 were collected from two sentinel hospitals in a subtropical region of China, Yichang city. The influenza virus positive rate among sampled ILI cases served as a proxy to estimate influenza seasonal characteristics, including periodicity, duration, peaks, and predominant subtypes/lineages. Epidemiological features of different years, seasons and age groups were analyzed, and vaccine mismatches were identified.
[h=4]RESULTS:[/h] In total, 8693 ILI cases were included; 1439 (16.6%) were laboratory-confirmed influenza cases. The influenza A positive rate (10.6%) was higher than the influenza B positive rate (5.9%). There were three influenza circulation patterns in Yichang: (1) annual periodicity (in 2013-2014, 2015-2016 and 2018-2019), (2) semiannual periodicity (in 2014-2015), and (3) year-round periodicity (in 2016-2017 and 2017-2018). Summer epidemics existed in two of the six years and were dominated by influenza A/H3N2. Winter and spring epidemics occurred in five of the six years, and A/H1N1, A/H3N2, B/Victoria, and B/Yamagata were codominant. During the study period, the predominant lineages, B/Victoria in 2015-16 and B/Yamagata in 2017-2018, were both mismatched with the influenza B component of the trivalent vaccine. Children 5-14 years old (26.4%) and individuals over 60 years old (16.9%) had the highest influenza positive rates.
[h=4]CONCLUSIONS:[/h] The seasonal epidemic period and the predominant subtype/lineage of influenza viruses in Yichang city are complex. Influenza vaccination timing and strategies need to be optimized according to the local features of influenza virus activity.
[h=4]KEYWORDS:[/h] influenza; seasonality; subtropical city
PMID: 32121519 DOI: 10.3390/vaccines8010108
Free full text