There are now more people who have contracted polio through vaccines than the wild virus itself.
The World Health Organization (WHO) published a report last week, which recorded nine new polio cases that were caused by the vaccines in four African countries in Nigeria, Central African Republic, Angola and the Congo.
A total of 16 countries have had similar outbreaks. That includes cases in other African counties, and in Asia in places such as the Philippines, China, Myanmar. It’s risen the count of polio cases caused by vaccines to 157.
