Singapore confirms one imported case of vaccine-associated polio; low risk of community transmission
VACCINATION Vaccination is the most effective protection against poliomyelitis, alongside maintaining high standards of hygiene and sanitation, said the health ministry. There are two vaccines for polio – OPV, which contains live attenuated or weakened poliovirus, and IPV, which does not contain any live poliovirus. Many countries have progressively switched to IPV, and Singapore stopped…