Children aged 1 to 9 living in London are being offered a dose of polio vaccine.
For some children, this is an extra dose, or other children it may bring them up to date with their routine vaccination.
There are signs that the virus is spreading in London and the number of children vaccinated in London is lower than it should be.
Boosting immunity in children should help protect them and reduce the risk of the virus continuing to spread.
Get your child vaccinated now
The NHS will contact parents of eligible children across North East London.
All parents with children aged 1 to 9 are being offered an appointment by their GP practice.
Additionally, there are a number of community vaccination centres, which parents can either book or walk in to with their child.
The website will be kept up to date as new information becomes available.