Vaccine BCG and OPV is given at the age / time of:

BCG stands for Bacillus Calmette Guerin.
It prevents from Tuberculosis (TB).
It's injected in Skin. It is also used to treat Bladder Cancer.
BCG Vaccine is most sensitive to heat and light and should be store at 2C to 8C.
BCG Vaccine may be store for long duration.
BCG Vaccine single dose is required for life time immunity. Second dose / booster dose is not recommended by WHO.
BCG drop out formula is (BCG – Measles * 1) / BCG * 100
BCG is administered within 24 hours of birth.
BCG Vaccine is useable within 6 hours of use.
BCG Vaccine is injected through 26 No Disposable Syringe.
BCG route is outer layer of skin.
BCG Vaccine represents sign on the arm of baby.
OPV stands for Oral Polio Vaccine.