Researchers in Hong Kong have cured infected monkeys with MERS by using existing drugs.

According to the South China Morning Post, the medicines—lopinavir with ritonavir and a type of interferon—were tested on marmosets, small monkeys that a 2014 U.S. study concluded would be the best subject for MERS trials because of the way their reactions to the virus mimics human illness. The drugs, currently used to treat HIV and sclerosis, were found to be effective in curing MERS-infected marmosets.

The research is the first of its kind in the world.

“We would recommend doctors to start using both drugs immediately to treat MERS patients if they are critical,” said Jasper Chan Fuk-woo, one of the researchers, told SCMP. “The evidence in this study is quite strong in proving the effectiveness of these two drugs.”

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