Winston, a 48-year-old gorilla living in a US zoo, has been cured of the coronavirus after receiving antibody treatment.

Unsuitable for humans, this treatment could however protect primates, which are able to contract and transmit the coronavirus.

Winston, a 48-year-old western plains gorilla infected with the coronavirus, has been treated with an experimental treatment with synthetic antibodies, the San Diego Zoo in California announced on Monday.

The gorilla had tested positive like several other primates on January 11, during an analysis of fecal matter.

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It was the first case of natural transmission of Covid-19 to great apes, and would have been infected by an asymptomatic employee, who however wore gloves.

"The group has been infected with a new, highly contagious variant of the coronavirus which was recently identified in California," the San Diego Zoo Global, the association managing the zoo, said in a statement.

Several gorillas have thus shown symptoms of a mild cough, a stuffy or runny nose, and episodes of lethargy.

A cocktail of antibiotics

Due to his advanced age and poor health, Winston was examined under anesthesia.

Suffering from pneumonia and heart disease, he was treated with a cocktail of heart drugs, antibiotics and "monoclonal" antibodies.

These antibodies, made in the laboratory and injected intravenously, mimic the functioning of the immune system after infection with the coronavirus.

The treatment based on "monoclonal" antibodies was approved in November in the United States, where it had been used experimentally in October to treat former President Donald Trump.

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Treatment unsuitable for humans

Winston received a treatment that cannot be used on humans, the zoo noted.

The animal care team "believe the antibodies may have contributed to its ability to overcome" the disease, he added.

Great apes are known to be susceptible to human viruses like influenza or chickenpox, due to the closeness between the two species.

Man and chimpanzee thus have 98% of their DNA in common.

Animals, wild or in captivity, are regularly vaccinated against a large number of diseases.

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Winston, a dominant male whose species is listed as endangered, arrived in San Diego in 1984 and will turn 49 on February 20.

He is considered one of the oldest residents of a zoo.

San Diego Zoo Global is now examining the possibility of vaccinating other animals with a treatment based on a synthetic version of the surface protein of the virus, intended for animal use.