According to a small study done at the University of Alabama having multiple tattoos may actually boost your immune system... or at least a "better than average immunity".
Researches conducted the study with 24 women and five men, ages 18-47, before and after they were tattooed. Researches measured their immune function prior to their tattooing session and then after. Final results showed a higher immune response post tattoo.
BUT, yup the big BUT...turns out people who had just gotten their first tattoo, were more susceptible to illness than those with multiple tats. To put it in different terms getting multiple tattoos is comparable to going to the gym and working out your muscles. The more you use your muscles the stronger they get. Apparently the same goes for tattoos and your immune system...the more you tats you have the stronger your immune system gets.
So NEVER let anyone tell you, you have too many tattoos...especially not during Flu Season!!!