He is being treated for acute respiratory syndrome and kidney failure.

WSJ: Mysterious Virus Emerges in the Middle East

The two deaths that appear to be the greater source of concern in the study were one patient with acute heart failure and another with respiratory failure.

FORBES: Pfizer's Key Drug Walks A Tightrope

All three died after suffering severe respiratory symptoms, including acute respiratory distress syndrome and eventually septic shock and multiple organ failure.

CNN: New bird flu well-adapted to infect people