Mpox Vaccination Produced 80% Breakthrough Rate

During the U.S. Centers for Disease Control and Prevention COCA Call today, experts confirmed new mpox cases have occurred in some vaccinated men in Chicago, Illinois. 

These mpox patients were vaccinated less than one year ago.

On side #46, the COCA call presented from March 18 through May 15, 2023:

• 21 men reported mpox infections to the Chicago Dept. of Public Health,
• 17 cases (of 21 with information) were vaccinated,
• 11 with two doses of the JYNNEOS® vaccine, 5 with one dose, and 1 with the smallpox vaccine ACAM2000,
• 5 had well-controlled HIV,
• And none were hospitalized.

'It is important that clinicians quickly identify cases to limit a possible mpox resurgence this summer in the United States,' wrote these CDC experts.

A replay of the COCA Call on May 18, 2023, will be accessible on this CDC webpage https://emergency.cdc.gov/coca/calls/2023/callinfo_051823.asp