Most of the patients are children with asthma.
“CDC has prioritized testing of specimens from children with severe respiratory illness,” the CDC said. “There are likely many children affected with milder forms of illness.”
The outbreak has affected 46 states as well as the District of Columbia. The CDC reported 32 states and the District of Columbia had reduced outbreaks, while just 12 states have higher numbers of cases. The only states without EV-D68 cases are Iowa, Montana, Nevada and Oklahoma.
The CDC has tested more than 1,400 samples, which is substantially more than the usual number of samples tested for EV-D68 during this time of year. Approximately half of the samples tested positive for EV-D68.
The CDC recently announced an improved method for diagnosing EV-D68. The heightened accuracy of the test may be contributing to the increased number of EV-D68 cases.
“These increases will not reflect change in real time or mean that the situation is getting worse,” the CDC said.
The CDC expects the number of EV-D68 cases to taper off in late fall.