(a) TB is Tuberculosis which is a bacterial disease caused by
Mycobacterium tuberculosis.(b) BCG is Bacille Calmette Guerin which is an effective vaccine against TB.
(c) DPT is Diphtheria Pertussis and Tetanus which is a three-in-one vaccine against these diseases.
(d) OPV is Oral Polio Vaccine which is the vaccine against poliovirus administered through oral route in children.