2 Influenza Vaccine Development Following the 1918 influenza pandemic (the “Spanish flu”), the post-pandemic A(H1N1) influenza strain was the only circulating strain [3]. The first experimental influenza vaccines were developed in the late 1930s [4], during which Thomas Francis Jr. and Jonas...
Flu vaccine mismatch results in low effectiveness
The vaccine was 35% effective at preventing hospitalization for seniors in one study, and 42% effective in a second analysis. For people with weak immune systems, the vaccine reduced the risk of hospitalization by 44% in one study and 30% in another. The flu hit early this season, as...
Vaccination is one of the best ways known to protect against the flu. However, because of the severity of this season, there have been questions raised about how well this year’s flu vaccine worked. Although the initial report of 36 percent overall efficacy for this year’s vaccine in the...
The Omicron variant has been associated with reduced vaccine effectiveness (VE) against mild disease with rapid waning. Meanwhile Omicron has also been associated with milder disease. Protection against severe disease has been substantially higher than p
Conclusion Among the 6 – 72 months old children in Yongkang and Yiwu city of Zhejiang province, the vaccine effectiveness of seasonal influenza vaccine during the 2017 – 2018 flu season is higher than that during 2016 – 2017 flu season and the vaccine effectiveness is higher among the childre...
have ever had Guillain-Barré syndrome (severe muscle weakness) within six weeks after getting a flu vaccine. The decision to give FLUCELVAX QUADRIVALENT should be made by your healthcare provider, based on careful...
The VE for preventing influenza A(H1N1)pdm09 was also analyzed in three hospitals where ImunoAce Flu and Linjudge FluA/pdm were utilized. We recorded the number of vaccine doses per patient (none, one, or two) and compared the VE among them. Because a single dose is recommended only ...
Similarly, influenza vaccination status was determined according to whether the subjects had received the flu vaccine in the autumn prior to the IPD date. The investigators who performed microbiological procedures and those who selected control subjects were unaware of the vaccination histories of the ...
This study uses data from 3 prospective cohort studies conducted in the US to assess vaccine effectiveness of bivalent COVID-19 vaccines against