The flu jab is based on a best guess of the anticipated flu strains each year, but I was just wondering whether the health service actually says whether they got the right strains, or they prefer us not to know.
The Workd Health Organisation models the likely strains each year. We have the advantage in the northern hemisphere of seeing which are the prevalent strains in the southern hemisphere and as we did last year, can change the strains involved in the vaccines.
The current vaccine is quadrivalent type - 4 different types targeted in the one vaccine. (The one for 65 and over is adjuvented - aQIV - which is effectively enhanced to make it more effective)
The guidance for 25/26 is that we will move to a trivalent (TIV) which will be more effective in targeting the current strains.