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Vaccination

vaccination_advancein_game/common/advances/0_age_of_revolutions.txt:4

With the development of vaccines, physicians are able to provide the populace with immunity against deadly diseases. These vaccines are helping to reduce the spread of disease and prevent epidemics. By injecting a small amount of weakened or dead bacteria or virus into the body, the immune system is able to recognize and fight off the disease if it ever encounters it again.