British health authorities say they will offer a polio booster dose to children aged 1 to 9 in London, after finding evidence the virus has been spreading in multiple regions of the capital despite not confirming any cases of the paralytic disease
British health authorities say they will offer a polio booster dose to children aged 1 to 9 in London, after finding evidence the virus has been spreading in multiple regions of the capital despite not confirming any cases of the paralytic disease
