South Korea and Singapore have both reported cases of monkeypox, health authorities said on Tuesday. The viral disease causes symptoms typically ranging from fever to muscle ache and skin rash, and has been confirmed in at least 41 countries. CNN reports that the case in Singapore involves a British man who was in the city-state between June 15 and 17. He tested positive for monkeypox on Monday after developing skin rashes and experiencing headaches and a fever last week. The case in South Korea involves a South Korean citizen who reported themselves to the Korea Disease Control and Prevention Agency after arriving back in the country from Germany on Wednesday.