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First known case of mpox reported in Bay Area county

FILE - This undated image provided by the National Institute of Allergy and Infectious Diseases shows a colorized transmission electron micrograph of monkeypox particles (red) found within an infected cell (blue), cultured in the laboratory that was captured and color-enhanced at the NIAID Integrated Research Facility in Fort Detrick, Md. (NIAID via AP, File)

(KRON) – The county of San Mateo has now had the first reported case of mpox in the United States, according to the California Department of Public Health (CPDH). 

What is mpox?

Mpox is an infectious disease that can cause a painful rash, enlarged lymph nodes, fever, headache, muscle ache, back pain and low energy, according to the World Health Organization. The organization said most people who get the disease fully recover. However, many people get extremely sick. 


Mpox is caused by the monkeypox virus (MPXV), according to the CDC.

Two kinds of the virus cause mpox, clade I and clade II, according to the Centers for Disease Control and Prevention. 

The case in San Mateo County was declared as clade I, which is the first in America. The clade II strain has circulated at “low levels” this year, according to the CDC.  

How to prevent getting mpox?

Mpox spreads through close or intimate contact with a person with the disease. Sharing space with an individual with mpox and/or sexual contact can result in the spreading of the disease. The CDC said mpox does not spread in settings where only respiratory spread is possible, such as across rooms, in markets or classrooms, etc.

The CPDH advises residents to take these precautions to stay safe: 

Residents can find the nearest mpox vaccine on the California Department of Public Health’s website.