The flu shot we get indicateds thermasoil (mercury) free.
Anyone who is in close contact with us. DH, DS and I all get flu shots. As to my parents and my inlaws. My BIL and his entire family get their flu shots. Daycare provides.
Before DS was born, I always got flu shots and noticed that I didn't seem to get the nasty colds, upper respiratory bugs that I would get every fall and late winter.
BTW, DS's doctor also gives us all prescriptions for tamiflu, so if the flu starts going around preschool or our offices, we're to get it filled and start taking it. First year my intern showed up to work with influenza, so I filled my script and took it. My coworkers are all morons -- always show up to work sick to share various ailments and to spread germs and happiness.