LOS ANGELES, May 17 (Xinhua) -- The U.S. Centers for Disease Control and Prevention (CDC) has warned of the potential risk for the resurgence of mpox, formerly known as monkeypox, this summer.

"In the United States, cases of mpox have declined since peaking in August 2022, but the outbreak is not over," the CDC said in an official health update earlier this week, adding that "spring and summer season in 2023 could lead to a resurgence of mpox as people gather for festivals and other events."

The alert to doctors across the United States came after a cluster of mpox cases were reported in the Chicago area.

From April 17 to May 5, 12 confirmed and one probable case of mpox were reported to the Chicago Department of Public Health, according to the CDC.

The nation's health protection agency noted it continues to receive reports of cases that reflect ongoing community transmission in the United States and internationally, encouraging vaccination for people at risk.

As of May 10, 30,395 mpox cases had been reported in the United States, said the CDC.