Please note - if you take statin drugs, vaccine for flu is especially not a good idea. The statin drugs are very dangerous all by themselves, and it would seem the combination is even more destructive to the immune system.
https://www.lewrockwell.com/2016/10/joseph-mercola/truth-flu-shots/What Recent Science Says About Annual Flu Vaccinations
It seems no matter how poor influenza vaccine effectiveness is, the call to vaccinate remains. But is getting an annual flu shot really “the best way” to protect yourself against influenza? Research frequently tells a very different story. For example, recent studies have shown that:
•With each successive annual flu vaccination, the protection afforded by the vaccine appears to diminish.7,8 Research published in 2014 concluded that vaccine-induced protection against influenza was greatest among those who had NOT received a flu shot in the previous five years.9
•The flu vaccine may also increase your risk of contracting other, more serious influenza infections.
◦Data shows that people who received the seasonal flu vaccine in 2008 had twice the risk of getting the H1N1 “swine flu” compared to those who didn’t receive a flu shot.10
◦Compared to children who do not get an annual flu vaccine, those who receive influenza vaccinations have a three times higher risk of hospitalization due to influenza.11
•Statin drugs — taken by 1 in 4 Americans over the age of 45 — may undermine your immune system’s ability to respond to the flu vaccine.12,13
After vaccination, antibody concentrations were 38 percent to 67 percent lower in statin users over the age of 65, compared to non-statin users of the same age.14 Antibody concentrations were also reduced in younger people who took statins.
•Independent science reviews have also concluded that flu shots do not appear to prevent influenza or complications of influenza.15,16
Influenza vaccine does not appear to prevent influenza-like-illness (ILI) associated with other types of viruses responsible for about 80 percent of all respiratory or gastrointestinal infections during any given flu season.17,18,19,20