Re: chicken pox vaccine effectiveness
My son is vaccinated and I thought he caught it. His rash looked exactly like the chicken pox rash. He wound up having infantigo instead. In his case the deciding factor (because even the doctor was borderline between the two in diagnosing) was the rash was concentrated on the face and while present on the rest of the body was very sparse. The other determining factor was he had had no known exposure to chicken pox. The final proof came when it responded immediately to antibiotics. So just a word of caution some of these "failed" vaccine cases may not actually be what they seem since some illnesses (at least one I know of for sure) can imitate the chicken pox rash.