Why Vaccinate? Posted on 07/03/2022 (13/05/2022) by joshua Why Vaccinate? March 7, 2022 Vaccines greatly reduce or eliminate many infectious diseases that are harmful to children, and adults. Viruses and bacteria or their new variants that cause disease still exist. Some have been controlled to low levels but still have the potential to spread if the number of non-immune persons increases. For this reason, vaccination against a disease of public health importance is necessary until such a disease is totally eliminated.