An Illinois man has become the third person in the United States infected with the virus that causes a deadly disease and has killed dozens of people around the world, federal officials said Saturday.

The unidentified man is a work associate of the first U.S. patient to have been diagnosed with the Middle East Respiratory Syndrome (MERS), the Centers for Disease Control and Prevention said in a statement. The first patient lives in Indiana. [The second in Florida]

While a blood test showed the Illinois patient was infected with the virus, he has not shown any symptoms and has not needed any medical care.  (read more)