It is a vaccine given to protect against polio, either by oral drops (OPV) (Sabin) which is given in the form of drops in the mouth as follows: first dose at the age of two months, the second dose at the age of 4 months, the third dose at the age of 6 months, and the dose fourth (stimulant) are given at the age of 18 months. The vaccination also given in the form of injection (Salk) (IPV) given at the age of one month and two months old.