Varicella/chickenpox vaccination Questions
I had a question about varicella/chickenpox vaccination. My cousin who is 19 years old is unsure of she has either had varicella/chickenpox in the past as a child or either the vaccination. In either case, she needs to get another vaccination shot (for immigration in the US purposes). My question is, is there any such thing as maybe overvaccination? Like for theoretical example, if she *DID* indeed have had either: the disease itself [or] the vaccination, will a vaccination again cause any harm like autism risks or anything?? Or is it harmless to vaccinate again either way? Thank you.