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Saudi officials said they were concerned the upcoming Hajj pilgrimage next month, which brings millions of people to Saudi Arabia from all over the world, could provide more opportunities for the virus to spread. They advised pilgrims to keep their hands clean and wear masks in crowded places.

The Hajj has previously sparked outbreaks of diseases including the flu, meningitis and polio.

Frank Jordans in Berlin and Abdullah Shihri in Riyadh, Saudi Arabia, contributed to this report.