I am a man, and a vaccinated man, and a man who has been revaccinated, and a man who

I am a double, or duplicate, of the man whose double I am. I am his counterpart, his match, his counterpart, his duplicate, his duplicate

I am a vaccine-lymph, and I am very small, but I am very important. I am a very small dose of a very attenuated and very attenuated vaccine, and I am used to prevent people from…