Video footage shows an individual wearing a costume jumping down into the enclosure, prompting the monkeys to rush to the top of a rock structure as the intruder walked around.
More than half of the rhesus macaque monkeys that escaped from a South Carolina lab have been recovered.
"She is well and having a peanut butter and jelly sandwich."
Mpox, also known as monkeypox, was first identified by scientists in 1958 when there were outbreaks of a "pox-like" disease in monkeys.
A heartwarming video shows a gorilla kissing a newborn baby at the Columbus Zoo in Ohio.
The female titi monkey was 33 years old, which is almost three times the life expectancy.