Indiana is one of 36 states that have reported cases of hepatitis in children with no known cause. The Centers for Disease Control said Wednesday that about 180 children have come down with the disease over the past seven months across the country.

Some of the children have needed liver transplants. But, that has decreased from 15 percent to 9 percent, as of May 5.

No deaths from the strain of hepatitis have been reported since February.

The CDC is investigating the cause, and possible links to coronavirus.

“Adenovirus has been detected in nearly half of the children and continues to be a strong lead. Further laboratory tests are being conducted to look more closely at the virus genome and other potential pathogens, such as SARS-CoV-2. In addition, CDC is communicating with key medical groups and continues to provide updated reporting and laboratory guidance for clinicians who may identify hepatitis of unknown cause in children,” read a statement from the CDC.

“We do not know if it’s connected to COVID, but there is a theory,” said Dr. Frita Fisher, a pediatric and internal medicine specialist, who was a guest on Fox News. “We do know that it is not connected to the vaccine because most of the children who are falling ill are less than 10 years of age. The majority have not received a COVID vaccine.”

Fisher said one theory, which has not been proven, is that some of the children may have had COVID and not known it, priming their immune systems for susceptibility to the Adenovirus, which has been linked to half the cases.

The disease is rare. But, the CDC says parents should still look for the main warning sign, which is jaundice, a yellow coloring to the skin.