what is herd immunity? Herd immunity is also called community immunity. Herd immunity happens when many people in a community become immune to an infectious disease that it stops the disease from spreading. How can we achieve Herd immunity? Herd immunity can be achieved in 2 ways. Critical percentage of population contract the disease and in time build up an immune response (Natural Immunity) Critical percentage of population are vaccinated against the disease to achieve immunity. So, what is this critical percentage of population? For some diseases, herd immunity can go into effect when 40 percent of the people in a population become immune to the disease. But in most cases, 80 to 95 ...Read More