I'm pretty good at dodging most of the little illnesses around, even though my immune systems is suppressed all the time (kidney transplant). Part if it I think is my immune system is really good, (even when squished) and build-up from 15 years of flu shots.
Learned one thing though the last time I was really sick. Tiny cold plus plane ride equals uber cold from hell.
My adivce Rem, get on the bed and stay there. Emerge as needed for sustenance.