The flue shots according to local news paper have mercury in them, this saves a fraction of 1 penny over using alcohol again according to the news paper explaining that these shots are perfectly safe. Medically I have read such shots often use things like Syphilis or varieties of much worse diseases; this is why many mds were so against all shots.
Many of the guys I have talked to explained they were vaccinated every 30 days while in the forces, if your hubby gets by with only a flue shot he is pretty lucky. I can imagine when he left the states they loaded him up with vaccinations at least 1 time.
In all, we must adapt and that is what it is all about, we must survive and our bodies do a great job.