The rare but serious polio-like illness called acute flaccid myelitis, or AFM is sweeping the nation.
The Centers for Disease Control and Prevention confirms 80 cases nationwide, that's eight confirmed cases more than last week.
Health officials are investigating 219 more.
AFM affects the spinal cord and can cause paralysis.
Almost all instances occur in children under 18 years old.
The CDC has noted an increase in reports of the disease since August.