The IMA Polio Vaccine Switch Awareness Campaign
A lot of progress has been made in the global efforts in achieving a polio-free world. The remaining two polio endemic countries are Afghanistan and Pakistan. But more needs to be done before polio can be eradicated from the world.
Replacing trivalent OPV with bivalent OPV is a significant step in polio eradication. The currently used OPV contains all thee polio serotypes - type 1, 2 and 3 and its use has led to the eradication of wild poliovirus type 2. The switch from tOPV to bOPV removes the type 2 component (OPV2) from the vaccine. April being the ‘low’ season for poliovirus transmission in many countries with endemic polio or recent polio cases has been chosen as the target date for the switch to bOPV in all OPV using countries. The switch from trivalent to bivalent vaccine has to be globally synchronized to minimize the risk of new cVDPV type 2 emergence.