Definition
1. Immunization or vaccination is inserting certain attenuated germs or toxins(vaccine) into human body by means of injecting or drinking(dropping into mouth) in order to increase body immunity against the disease.
2. Hepatitis B is an intramuscular injection (injection to the mucsle), usually on the thigh, given to baby to prevent Hepatitis B. This injection is given 3 times. The first injection given when the baby is 0 month old, the second is given at the age of 1 month, and the third is at the age of 6 months.