Four cases of enterovirus D-68 have been confirmed at Boston Children's Hospital.
Officials clarify that these are not the same four children who were treated for Polio-like symptoms.
The government says this strain of enterovirus has sickened at least 500 people in over 40 states. Almost all have been children.
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One Rhode Island girl who was confirmed to have enterovirus D-68 died of a staph infection last week. State health officials say this is a very rare combintation.
On Tuesday, Doctor Mark Gorman of Boston Children's Hospital said that some children with enterovirus in Colorado are exhibiting Polio-like symptoms, such as numbness of limbs. The Center for Disease Control is investigating the possibility of a connection.
Although the virus is serious, public health officials are urging the public not to panic. They say washing hands throughout the day significantly lowers the chances of catching the virus.