We have an interesting question here. Someone was given an influenza vaccine in September for the 2020/2021 season, valid until September 2021. On the one hand, everything is logical, but on the other hand, other strains and types in the influenza vaccine for 2022 may be recommended.
Well, that is, there in the vaccine are the strains of the influenza virus that are expected next season in the Northern Hemisphere. These strains have five different characteristics, which are written with a slash. If they were relevant last season, then this season they may not be relevant. At the beginning of the year, the World Health Organization announces the nominees for the next year, just before the Oscars.
So it turns out that formally last year's vaccine has not yet rotted, but the strains in it may already be outdated. There is a desire to catch up with the second fresher vaccine. But there are doubts.
In fact, two influenza vaccines in the same season are sometimes given.
They are made for children who were vaccinated for the first time. Such children are injected with the second dose in a month.
They tried to do roughly the same thing to people after organ transplants.
Thirty years ago, they also tried to vaccinate older people with two doses of influenza vaccine, but they did not receive additional benefits.
In short, if you got the 2021/2022 vaccine, it will be one shot.
If, for some reason, the vaccine of the 2020/2021 season is stuck in you, then there will be no harm from this, and it may even be enough. But you have the opportunity to be vaccinated with a fresh vaccine of the 2021/2022 season in a month. There will probably not be any harm from this either.
If you come to some commercial medical center where you are vaccinated against influenza, then usually an immunologist sits there. Ask him. It may well be that there will be much less choice of influenza vaccines this season. Therefore, there will be different miracles. Watch what you have been injected.