Report Vaccine injuries resulting in encephalopathy/PANS in PANS / PANDAS (Lyme included) Posted November 4, 2012 Tiredmom...I did not know the connection immediately either. The the lights went on went we saw an immunologist that said it takes at least 20 days for the body to mount a defense to a vax. I went home and looked at our calendar and it was 20 days exactly from vax to flip of switch PANS. My son had the chickenpox vac. and exactly 21 days later he got sick and was just not right, and has not been right since, and we are now on the "pandas journey" I have asked all of the dr. that we have been to if this could be a reaction to the vaccine, and most tell me that it is not likely given that the symptoms were not immediate. Myself and my mother are convinced that this is a reaction. Needless to say, my younger son will not be getting any further vaccinations until we figure this out...whenever that may be!