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Health officials in several U.S. cities, including Philadelphia, Atlanta, Chicago and Los Angeles County, reported potential cases of monkeypox on Thursday.

Georgia health officials said Thursday that a man in the metro Atlanta area with an international travel history was at risk of contracting a monkeypox infection and that confirmation of test results by the CDC was pending.

Los Angeles County health officials recently reported their first case in a patient who was in close contact with another infected person while traveling. Three potential cases have previously been found in Sacramento County.

Philadelphia and Chicago also reported their first potential monkeypox cases on Thursday.

According to the CDC, at least 19 cases have been reported in 10 different states since Massachusetts first confirmed the US case on May 18.

The Centers for Disease Control and Prevention's handout graphic shows the symptoms of one of the first known cases of monkeypox virus on a patient's hand since May 27, 2003.

The Centers for Disease Control and Prevention’s handout graphic shows the symptoms of one of the first known cases of the monkeypox virus on a patient’s hand since May 27, 2003.
(CDC / Getty Images)

Monkeypox belongs to the same genus of virus as smallpox and has symptoms such as fever, headache and fatigue.

Monkeypox virus cases: NYC identifies 2 other potential infections

Within 1-3 days of the onset of symptoms, patients develop a rash that eventually turns into blisters. The virus mainly spreads through skin-to-skin contact with infected people, although it can also be transmitted through aerosols “during prolonged, face-to-face contact”, according to the CDC.

Available through the Centers for Disease Control and Prevention, the 2003 electron microscope image shows mature, oval-shaped monkeypox virions, left and globular immature virions derived from a sample of human skin from the 2003 Prairie Dog outbreak.

Available through the Centers for Disease Control and Prevention, the 2003 electron microscope image shows mature, oval-shaped monkeypox virions, left and globular immature virions derived from a sample of human skin from the 2003 Prairie Dog outbreak.
(Cynthia S. Goldsmith, AP by Russell Regner / CDC)

The World Health Organization has confirmed more than 550 cases in 30 countries since England confirmed its first cases on May 6.

US monkeypox cases have risen, another reported in Colorado

“We’ll see all the cases appear in a very short period of time. In a few days, in two weeks, we’ll see more than 500 cases. It’s different. It’s never been seen before,” Rosamund Lewis, WHO’s technical leader for MonkeyPox, said this week.

In these Centers for Disease Control and Prevention handout graphics, the patient's hands show the symptoms of one of the first cases of the monkeypox virus.

In these Centers for Disease Control and Prevention handout graphics, the patient’s hands show the symptoms of one of the first cases of the monkeypox virus.
(CDC / Getty Images)

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According to the WHO, most cases worldwide are “reported primarily in men who have sex with men”.

“Right now, we’re not worried about a global pandemic,” Dr. Lewis said earlier this week. “We are concerned that individuals may acquire this infection through high-risk exposure if they do not have the information they need to protect themselves.”