a meta-study analyzing 22-23 flu studies over the last 50 years to see the efficacy of the flu vaccine found that getting the flu shot only decreased your chances of getting the flu by 4%.
IOW it’s hardly effective and hardly worth it. especially if you already take hygiene/disinecting precautions with hands, exposure, etc.
This years shot is supposed to give 63% immunity. Next years could be worse or better, they have to out guess the flu mutation. There has been a lot of progress in medical science in 50 years. They are now working on a vaccine that will innoculate for all types of flu which you will need to get only once in every 10 years.