What are the vaccines  and which vaccines should be considered for adults  for adults? What are vaccines? A vaccine is a biological preparation that provides active acquired immunity to a particular disease. What are the constituents of vaccine? A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins. How the vaccines work? Vaccine stimulates the immune system in the…