Probably not. Thanks for the query. You might already been exposed though. The chickenpox vaccine is a shot that can protect nearly anyone who receives the vaccine from catching chickenpox. Two doses of the vaccine are about 98% effective at preventing chickenpox. Some people who are vaccinated against chickenpox may still get the disease. However, it is usually milder with fewer skin blisters and little or no fever. If you have never had chickenpox and are not vaccinated, you can get vaccinated within five days of coming into contact with someone who is infected, the efficacy is 55% in such cases.