The Centers for Disease Control and Prevention is looking for any connections between nine cases of children suffering from limb weakness and paralysis and the widespread outbreak of Enterovirus 68.

A statement released by the CDC Saturday said that nine children in the Denver area reported having a neurologic illness that led to some limb weakness or paralyzation. All of the children had some sort of respiratory virus before the limb weakness symptoms appeared.

ABC News reported that six of the children tested positive for a rhinovirus or enterovirus, four of those cases were distinctly Enterovirus 68. The other cases were still waiting for test results.

Chief medical officer and executive director for Colorado Department of Public Health and Environment Dr. Larry Wolk said the patients ranged in age from 1 to 18 years old, the average age being around 10.

"It is a spectrum of arm or leg weakness that can be as mild weakness or as severe as paralysis," Wolk said. "What ties them all together though are findings of spots or lesions in the grey matter of the spinal cord on MRI scans."

Officials have not confirmed whether the Enterovirus 68 was responsible for causing the neurological symptoms, but the CDC is collecting information if any similar cases have been reported in other areas. Wolk said parents should be aware but not panicked by the situation.

"It's a pretty rare complication and not unexpected with this kind of viruses," Dr. Wolk said. "You hear about this nine with this complication, what youre not hearing about is that thousands or hundreds of thousands [that just have the respiratory disease]."

The Enterovirus 68 has been reported in at least 40 states and 277 confirmed cases, according to the CDC. Symptoms are similar to the flu, including coughing, runny nose and fever, but can present themselves in mild forms, so the number of infected persons could be larger than what has been reported.