New tests show an Illinois business associate of the first MERS patient did not contract the virus.
An Illinois man, who was in contact with an Indiana man with MERS, has now also tested positive for the virus.
Employees who were in direct contact with the first U.S. patient identified with MERS have been released from home isolation.
According to state health officials, the person being treated for Middle East Respiratory Syndrome (MERS) was released from the hospital on Friday.
The Centers for Disease Control and Prevention have confirmed the first case of a relatively new virus in the United States known as MERS.
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The patient identified with the respiratory virus MERS is in good condition and is improving, health officials say.
CDC officials say a person who traveled from Saudi Arabia to Indiana is the first person in the United States to be identified with the respiratory virus MERS.