'Rare' Complication Led To Kyle Busch's Death at 41

Kyle Busch had a "weird" and "rare" complication that led to his death at 41, a prominent doctor told USA TODAY.

The NASCAR Cup Series driver died from sepsis, as a result of pneumonia complications, his family said in a statement last week.

"The medical evaluation provided to the Busch Family concluded that severe pneumonia progressed into sepsis, resulting in rapid and overwhelming associated complications," the Busch family statement read. "The Family asks for continued understanding and privacy during this difficult time."

But what happened, exactly?

Dr. Ryan Maves, chief of critical care medicine at Wake Forest University and an infectious disease physician, told USA TODAY that the complication that Busch had was "weird and rare."

It's extremely rare for someone in their 40s to die from pneumonia.

"For people in their 40s who get sick enough to land in the hospital with pneumonia, roughly 1% die from it,” Maves said. "Factor in everyone who gets pneumonia at that age and never needs to be hospitalized at all, and the number drops even lower. Most are treated at a clinic and sent home."

Two things 'stood out' in Busch's death

Busch had been sick for a few weeks and was coughing up blood the day before his death. Both of those things stand out.

“People start with a viral pneumonia and then you get a bacterial superinfection on top of that,” Maves said. “Classically influenza, but some other viruses can do this as well.”

Whatever transpired was obviously extremely severe.

“These can be very severe, and they can progress very quickly,” Maves said. “When I think of a young man dying of pneumonia after a preceding period of illness, that is the thing I think about a lot.”

However, people should not be panicking. It's still quite rare to have what Busch did.

“The best way to deal with pneumonia is to prevent it,” Maves said. He recommended vaccines for anyone 50 or over and for younger people with asthma, heart disease, kidney disease or diabetes. Plus annual flu shots and other vaccines as recommended by doctors.

“Your risk of death from pneumonia at 41 is very, very, very low,” Maves said. “But I bet you have a grandparent. Part of the prevention is not just for ourselves but for the vulnerable people around us.”

Our thoughts continue to be with Busch's friends and family members.