<s>[INST] My five yr old granddaughter has chicken pox and i cant remember if i had it or not. However, in our young days i remember my sister having it but i do remember not catching it from her. So therefore,this being so contagious i should have gotten it from her! so i must of been ill with the chicken pox when i was much younger to a point of not remembering.Is it possible to live with someone that has chicken pox and not catch from her?The Doc that saw my granddaughter was worried on my behalf cause I m 50 yr old n i told him that i never had the chicken pox that i remember of n so he wrote me a script for the vaccine.My other sister said we must of gotten it when we were small and we did not have all the symptoms of the Varicella..meaning no scare marks.Is that possible? haha 2 questions thanx for your time!! [/INST] Hello dear, Thank you for your contact to Chat Doctor. I read and understand your concern. I am Chat Doctor answering your concern. Chicken pox is very contagious infection, and it can be caught to anybody who comes in close contact. It is possible that when you are young you might not be in a close contact so you haven't caught any infection from the sister. If you are in query you can test yourself for antibody titles in the blood for chicken pox virus. This test is costly and only few laboratories can conduct it. If you don't have enough title than you are at risk and can develop the infection. In this case get vaccinated against chicken pox is better option because it can be life-threatening condition at adult age. Please maintain good hygiene around you, it will help you combat the infection same as vaccine. I will be happy to answer your further concern on bit.ly/ Chat Doctor. Thank you, ChatDoctorInfectious diseases specialist, ChatDoctor. </s>