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LA PAZ (Reuters) - Bolivian President Evo Morales has been treated for a sore throat in Cuba and will stay on the Caribbean island for several days of medical observation, Bolivia’s Vice President and acting head of state Alvaro Garcia Linera said on Thursday.

“His health is under control and the medical outlook is positive,” Garcia Linera told a news conference in La Paz.

Morales, 57, went to Cuba for treatment on Wednesday after a sore throat robbed him of his voice, causing him to cancel public appearances.

The leftist former coca farmer was expected to return to Bolivia in four days, Garcia Linera said.

Morales took office in the Andean country in 2006 and was elected to a third term in 2014. He said last year he may run for a fourth consecutive term in 2019 elections despite losing a referendum that would have reformed the country’s constitution to allow him to run again.