My daughter, who was vaccinated as a baby, contracted chicken pox from her friend, who was never vaccinated. My son, also vaccinated against it, also caught it. My younger son, also vaccinated, did NOT get it. Doc said it was because his vaccine was more recent & stronger.Good luck - I had it as a kid & all that itching is a BUMMER!**********************************My daughter got it by just being in the same room as the other girl. No sneezing, or physical contact.