How pneumonia progresses to sepsis: Doctors explain after Kyle Busch's death

NASCAR star Kyle Busch’s cause of death was revealed Saturday as severe pneumonia that progressed into sepsis, according to a statement released by his family. The two-time Cup Series champion, 41, died on Thursday after a brief hospitalization with a "severe illness."

"The medical evaluation provided to the Busch Family concluded that severe pneumonia progressed into sepsis, resulting in rapid and overwhelming associated complications," read the statement, which was shared in a news release...