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The monkeypox virus has spread to 20 US states and the nation’s capital.
So far, 113 cases of infection have been registered, most of them in California, New York, Illinois and Florida.
The New Jersey Department of Health announced its first probable case on Monday, and Missouri officials identified a potential case in a Kansas City resident over the weekend.
Cases of monkeypox and orthopoxvirus are in single digits elsewhere, according to the Centers for Disease Control and Prevention (CDC).
Currently, more than 35 countries where monkeypox is not endemic have reported outbreaks of the viral disease, with more than 2,500 confirmed cases.
The World Health Organization (WHO) is convening an emergency meeting this week to determine whether the outbreak should be considered a global health emergency.
The United Nations Health Agency (UN) has said that people with monkeypox can be contagious for up to four weeks and advised those infected to self-isolate until fully recovered.
While the majority of new cases of monkeypox have been reported among gay or bisexual men, experts warn that everyone is at risk.
Usually people become infected with the monkeypox virus by contact with skin lesions or body fluids of infected animals or humans, or by contact with materials contaminated with the virus.
The disease is commonly found in parts of central and western Africa.
Smallpox associated monkeypox has milder symptoms.
Some of these symptoms include fever, chills, rash, and pain before lesions develop.
Reuters and the Associated Press contributed to this report.