tetano
Editor, Senior Moderator
Int J Infect Dis
. 2023 Jul 20;S1201-9712(23)00659-8.
doi: 10.1016/j.ijid.2023.07.008. Online ahead of print. Lack of neutralizing antibodies against influenza A viruses in adults during the 2022/2023 winter season - a serological study using retrospective samples collected in Hong Kong
Weiwen Liang[SUP] 1 [/SUP], Huibin Lv[SUP] 2 [/SUP], Chunke Chen[SUP] 3 [/SUP], Yuanxin Sun[SUP] 3 [/SUP], David S Hui[SUP] 4 [/SUP], Chris Ka Pun Mok[SUP] 5 [/SUP]
Affiliations
Background: Seasonal influenza infection cases decline significantly in Hong Kong since the COVID-19 pandemic has begun in 2020. This also reduced the opportunities of reinducing influenza-specific antibodies in the community. The levels of antibodies in protecting against recently circulating influenza A viruses in post COVID-19 era are unclear.
Methods: Paired plasma samples which were collected in 2021 and 2022 from 479 healthy adults in Hong Kong were tested. The neutralizing titer in plasma against the influenza A (H1N1) and (H3N2) viruses circulating before or after the COVID-19 outbreak were determined using microneutralization assay.
Results: The H1N1 and H3N2 vaccine strains which have been selected for the 2022/23 season are phylogenetically closed to the recently circulating viruses. In samples collected in 2022, only 14.61% and 0.42% showed neutralization titer MN[SUB]50[/SUB] ≥1:20 to the H1N1 A/Wisconsin/588/2019 (H1/Wis19) and H3N2 A/Darwin/6/2021 (H3/Dar21), respectively. Participants who reported receiving flu vaccination annually had higher seropositive rate to H1/Wis19 than those who had never received flu vaccine (28.06% vs 5.30%). SS: Our results indicate adults in Hong Kong are generally lack of neutralizing antibodies against the circulating influenza A viruses especially the H3N2, highlighting the importance of promoting flu vaccination in the post-COVID-19 era.
Keywords: Influenza A virus; neutralizing antibody; vaccination.
. 2023 Jul 20;S1201-9712(23)00659-8.
doi: 10.1016/j.ijid.2023.07.008. Online ahead of print. Lack of neutralizing antibodies against influenza A viruses in adults during the 2022/2023 winter season - a serological study using retrospective samples collected in Hong Kong
Weiwen Liang[SUP] 1 [/SUP], Huibin Lv[SUP] 2 [/SUP], Chunke Chen[SUP] 3 [/SUP], Yuanxin Sun[SUP] 3 [/SUP], David S Hui[SUP] 4 [/SUP], Chris Ka Pun Mok[SUP] 5 [/SUP]
Affiliations
- PMID: 37481108
- DOI: 10.1016/j.ijid.2023.07.008
Background: Seasonal influenza infection cases decline significantly in Hong Kong since the COVID-19 pandemic has begun in 2020. This also reduced the opportunities of reinducing influenza-specific antibodies in the community. The levels of antibodies in protecting against recently circulating influenza A viruses in post COVID-19 era are unclear.
Methods: Paired plasma samples which were collected in 2021 and 2022 from 479 healthy adults in Hong Kong were tested. The neutralizing titer in plasma against the influenza A (H1N1) and (H3N2) viruses circulating before or after the COVID-19 outbreak were determined using microneutralization assay.
Results: The H1N1 and H3N2 vaccine strains which have been selected for the 2022/23 season are phylogenetically closed to the recently circulating viruses. In samples collected in 2022, only 14.61% and 0.42% showed neutralization titer MN[SUB]50[/SUB] ≥1:20 to the H1N1 A/Wisconsin/588/2019 (H1/Wis19) and H3N2 A/Darwin/6/2021 (H3/Dar21), respectively. Participants who reported receiving flu vaccination annually had higher seropositive rate to H1/Wis19 than those who had never received flu vaccine (28.06% vs 5.30%). SS: Our results indicate adults in Hong Kong are generally lack of neutralizing antibodies against the circulating influenza A viruses especially the H3N2, highlighting the importance of promoting flu vaccination in the post-COVID-19 era.
Keywords: Influenza A virus; neutralizing antibody; vaccination.