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LONDON — The World Health Organization welcomed an “historic step” towards a polio-free world on Thursday as an expert panel certified that the second of three types of the crippling virus has been eradicated globally.

The announcement by the Global Commission for the Certification of Poliomyelitis Eradication means that only wild polio virus type 1 is still circulating, after type 2 was declared eradicated in 2015, and type 3 this week.

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Global polio cases have been cut by more than 99% since 1988, but type 1 polio virus is still endemic in Pakistan and Afghanistan, where it has infected a total of 88 people this year. That is a resurgence from a record low global annual figure of 22 cases in 2017.

“The eradication of wild polio virus type 3 is a major milestone towards a polio-free world, but we cannot relax,” said Matshidiso Moeti, the WHO regional director for Africa.

Seth Berkley, chief executive of the GAVI vaccine alliance, said it was “a tremendous victory in the fight against polio.”