2023 Ohio pneumonia outbreak

In late 2023, an outbreak of mycoplasma pneumonia occurred in Ohio in the United States, primarily affecting children. Despite it occurring at around the same time, experts say that it is unrelated to the 2023 Chinese pneumonia outbreak. The average age of children affected is eight years old, with some cases being as young as three. As of December 1, 2023, investigation as to the cause is still ongoing.

November 2023
On November 30, Warren County, Ohio reported an unusually high number of pediatric pneumonia cases, reporting 142 cases since August.

December 2023
On December 1, former Centers for Disease Control and Prevention director Tom Frieden said that the outbreak could be the result of an "immunity gap" caused by COVID-19 lockdowns, leaving people more susceptible to infections by Influenza, Respiratory syncytial virus, and COVID-19.