Cases had now been recorded in every state, according to the Centers for Disease Control and Prevention. That’s up from 44 states and Washington, D.C., at the end of July and from 14 states and Washington, D.C., at the beginning of June.
In total, the U.S. has reported more than 21,000 cases since the beginning of May. The total worldwide exceeds 56,000.
According to an NBC News analysis of CDC data, the seven-day average of reported new cases decreased from an average of 463 on August 10 to an average of 242 on Sept. 7.
The virus is transmitted primarily through close physical contact. Recent cases are mostly among men who have sex with men.
The World Health Organization declared the outbreak a public health emergency in July. In the last three weeks, California, Illinois and New York state have issued emergency declarations over the continued spread of monkeypox.
Dana Varinsky contributed.