According to the National Immunisation Schedule, OPV (oral polio vaccine) contains how many types of Poliovirus?
A. Type 1
B. Type 2
C. Type 3
D. Type 4
According to National Immunisation Schedule, OPV (oral polio vaccine) contains how many types of Poliovirus?
A. Type 1
B. Type 2
C. Type 3
D. Type 4