saw its first case in Massachusetts on May 18. the largest number in any one country during the current outbreak, which was first detected in London on May 6. and 911 cases worldwide, including 225 in the U.K. The Centers for Disease Control and Prevention is currently working to confirm the diagnosis, with test results expected this week.Īs of Sunday, there were 24 confirmed cases of monkeypox in 11 states in the U.S.