tetano
Editor, Senior Moderator
Clin Microbiol Infect. 2015 Apr 13. pii: S1198-743X(15)00373-0. doi: 10.1016/j.cmi.2015.03.009. [Epub ahead of print]
[h=1]Epidemiological study of influenza B in Shanghai during the 2009-2014 seasons: implications for influenza vaccination strategy.[/h] Zhao B[SUP]1[/SUP], Qin S[SUP]2[/SUP], Teng Z[SUP]3[/SUP], Chen J[SUP]3[/SUP], Yu X[SUP]3[/SUP], Gao Y[SUP]3[/SUP], Shen J[SUP]3[/SUP], Cui X[SUP]3[/SUP], Zeng M[SUP]4[/SUP], Zhang X[SUP]5[/SUP].
[h=3]Author information[/h]
[h=3]Abstract[/h] A new quadrivalent influenza vaccine has been available for influenza B, which can pose a significant global health burden. Shanghai has the highest GDP and largest metropolitan population in China. To understand the impact of influenza B in Shanghai in terms of age-related incidence and relative prevalence compared with other subtypes, we conducted this retrospective epidemiological study of influenza B in the 2009-2014 seasons. A total of 71 354 outpatients with influenza-like illness were included, and both lineages of influenza B and subtypes of influenza A were identified using real-time RT-PCR. The antigenic characteristics of influenza B isolates were analysed by sequencing and reciprocal haemagglutinin inhibition assay. On average, 33.45% of influenza strains were influenza B, and 40.20% of strains isolated from children were influenza B. The incidence of influenza B was highest (12.52 per 100 people with influenza-like illness) in children ages 6-17 years and usually peaked in this age group at the early stage of an influenza B epidemic. Overall, both matched and mismatched influenza B strains co-circulated in Shanghai annually, and 44.57% of the circulating influenza B belonged to the opposite lineage of the vaccine strains. We concluded that influenza B has caused a substantial impact in Shanghai and that school-aged children play a key role in the transmission of influenza B. Hence, it may be beneficial to prioritize influenza vaccination for school-aged children to mitigate the outbreaks of influenza B.
Copyright ? 2015. Published by Elsevier Ltd.
[h=4]KEYWORDS:[/h] Epidemiology; influenza B; lineage; school-aged children; vaccination
PMID: 25882368 [PubMed - as supplied by publisher]
[h=1]Epidemiological study of influenza B in Shanghai during the 2009-2014 seasons: implications for influenza vaccination strategy.[/h] Zhao B[SUP]1[/SUP], Qin S[SUP]2[/SUP], Teng Z[SUP]3[/SUP], Chen J[SUP]3[/SUP], Yu X[SUP]3[/SUP], Gao Y[SUP]3[/SUP], Shen J[SUP]3[/SUP], Cui X[SUP]3[/SUP], Zeng M[SUP]4[/SUP], Zhang X[SUP]5[/SUP].
[h=3]Author information[/h]
[h=3]Abstract[/h] A new quadrivalent influenza vaccine has been available for influenza B, which can pose a significant global health burden. Shanghai has the highest GDP and largest metropolitan population in China. To understand the impact of influenza B in Shanghai in terms of age-related incidence and relative prevalence compared with other subtypes, we conducted this retrospective epidemiological study of influenza B in the 2009-2014 seasons. A total of 71 354 outpatients with influenza-like illness were included, and both lineages of influenza B and subtypes of influenza A were identified using real-time RT-PCR. The antigenic characteristics of influenza B isolates were analysed by sequencing and reciprocal haemagglutinin inhibition assay. On average, 33.45% of influenza strains were influenza B, and 40.20% of strains isolated from children were influenza B. The incidence of influenza B was highest (12.52 per 100 people with influenza-like illness) in children ages 6-17 years and usually peaked in this age group at the early stage of an influenza B epidemic. Overall, both matched and mismatched influenza B strains co-circulated in Shanghai annually, and 44.57% of the circulating influenza B belonged to the opposite lineage of the vaccine strains. We concluded that influenza B has caused a substantial impact in Shanghai and that school-aged children play a key role in the transmission of influenza B. Hence, it may be beneficial to prioritize influenza vaccination for school-aged children to mitigate the outbreaks of influenza B.
Copyright ? 2015. Published by Elsevier Ltd.
[h=4]KEYWORDS:[/h] Epidemiology; influenza B; lineage; school-aged children; vaccination
PMID: 25882368 [PubMed - as supplied by publisher]