Mpox in the United States Fast Facts

Here's a look at mpox, formerly known as monkeypox, in the United States. In 2022, an outbreak was declared a public health emergency of international concern by the World Health Organization (WHO). The virus originated in Africa and is the cousin of the smallpox virus.

In November 2022, WHO renames the monkeypox virus as mpox after working with International Committee on the Taxonomy of Viruses (ICTV) to rename the the virus using non-stigmatizing, non-offensive social and cultural nomenclature.

(Source: Centers for Disease Control and Prevention)

Mpox is a poxvirus. It generally causes pimple- or blister-like lesions and flu-like symptoms such as fever. The disease is rarely fatal.

Mpox spreads through close contact. This includes direct physical contact with lesions as well as "respiratory secretions" shared through face-to-face interaction and touching objects that have been contaminated by mpox lesions or fluids. The virus may also pass to a fetus through the placenta.

Anyone can become ill from mpox, but the US Centers for Disease Control and Prevention (CDC) says that more than 99% of mpox cases in the United States in the 2022 outbreak have been among men who have sex with men. However, mpox is not generally considered a sexually transmitted disease.

Mpox is usually found in West and Central Africa, but additional cases have been seen in Europe, including the United Kingdom, and other parts of the world in recent years. Those cases are typically linked to international travel or imported animals infected with the poxvirus.