“Spring and summer season in 2023 could lead to a resurgence of mpox as people gather for festivals and other events,” the Centers for Disease Control and Prevention said in an alert Monday for health care professionals.
Cases of the virus, formerly called monkeypox, have stayed low in the U.S. since they peaked last August — when 646 cases were reported in one day. There has been however, a recent cluster reported in the Chicago area, the CDC said.
Over a recent 18-day period, the city’s health department saw 12 confirmed cases and one probable case of the virus.
All of the cases from April 17 to May 5 were among symptomatic men — 69% of whom had received both doses of the two-dose Jynneos mpox vaccine.
The CDC said it does not know why such a high percentage of the people vaccinated became infected. It also doesn’t know whether immunity after vaccination has decreased among those individuals, or if the virus has mutated. The agency said it is conducting studies to help determine how long immunity post-vaccination lasts.
Though no vaccine is 100% effective in preventing infection, it does reduce the chances of getting and spreading the virus and could make the symptoms less severe, the CDC said.
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