An ultrasound of his heart would help them look for unusual infections in the valves that can take weeks to grow in cultures.

An autopsy also found an extremely unusual bacterial infection in his stomach, which may have caused the bleeding.

An autopsy confirmed the sailor's pneumonia but could not determine what had made his body so vulnerable to the unusual infections that killed him.

Since Sept. 11 the agency has also offered doctors training materials to sharpen their ability to recognize anthrax and other unusual infections.

Strange sent off blood to look for evidence of an unusual infection.

The cause of death was found to be an unusual bacterial infection that caused gas gangrene in his stomach.

The medical analysis program can't spot any unusual infections or viruses.

People who have an impaired immune system are at risk for these unusual infections.

There are some serious and unusual infections that result in both a fever and a rash.

"One of the challenges we had was that they had this unusual bacterial infection that's not been documented in a shelter before," she said.