Many experts feel that injectable vaccine should be introduced during the transition phase
With oral vaccines, India appears to have achieved what was once thought a Herculean task — decisively breaking the circulation of wild polio viruses that paralysed countless children. But the use of oral vaccines, which contain live but weakened strains of the virus, can be a bit like riding a tiger. Discontinuing them, without risking a resurgence of polio that would undo all that has been achieved, is going to be a tricky exercise.