Question: is 2019 flu shot effective uk?
Answer: The vaccine given to adults aged 18 to 64 in at-risk groups is estimated to be 39% effective against the same strain. Influenza A(H1N1)pdm09 has been the main strain circulating this season. As the number of cases is lower, a precise estimate for those aged 65 and over will not be available until the end of the season.