I am a citizen of the world, and my name is

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…

This question was first published in the year 1840, and the answer was as follows:-I am a little short life, included between the extended limits of birth and death, from the…