Health authorities in Sierra Leone have declared a state of emergency after the country reported its second case of pox in less than four days.
The health ministry said neither case had known recent contact with infected animals or other sick individuals.
Mpox, also known as monkeypox, was first identified by scientists in 1958 when outbreaks of a pox-like disease in monkeys occurred. Until recently, most human cases were seen in people in central and West Africa who had close contact with infected animals.
In 2022, the virus was confirmed to spread via sex for the first time and triggered outbreaks in more than 70 countries across the world that had not previously reported mpox.
The Congo has borne the brunt of the epidemic, with a vast majority of the roughly 43,000 suspected cases and 1,000 deaths in Africa this year.
Sierra Leone was previously the epicentre of the 2014 Ebola outbreak, the deadliest in history.
The outbreak, primarily concentrated in West Africa, affected Sierra Leone the most, with nearly 4,000 deaths out of the more than 11,000 recorded globally.
The country also lost 7% of its healthcare workforce to the outbreak.
