Details of Illinois MERS patient emerge

New details have emerged about the Illinois man who tested positive for MERS and it seems he never knew he was sick.

It is thought to be the first case of MERS infection transmitted in the United States. Health officials think he caught the virus during a business meeting with the MERS patient in Indiana.

An initial test on the man from Illinois came back negative. A second test showed his body had fought MERS and won.

More than 160 people with the virus have died. Most of those who died were from the Arabian Peninsula, ground zero for the disease.

"We're going to see more cases, people are traveling," said Dr. Marty Cetron, CDC, Global Migration and Quarantine. "Travel to the peninsula is about to kick off. Pilgrimage holidays and Ramadan are coming up at the end of June."

Investigators with the Centers for Disease Control say the case in Illinois shows someone can contract the virus and remain healthy.