Nothing sounds better after a long day of skiing in the cold mountain air than unwinding in a hot tub.

But before you throw on your bathing suit, you should probably know about this warning from the Centers for Disease Control and Prevention.

9NEWS Medical Expert Dr. Comilla Sasson says there has recently been a study that showed there were 92 people who were in a hot tub in Tennessee and had an outbreak of Legionnaires’ Disease.

One of those people died.

Sasson says the disease can live in warm water from hot tubs to swimming pools to even humidifiers, so before you indulge, make sure that it’s clean.

She says the symptoms of Legionnaires' disease range from pneumonia to fevers to body ache – and it could be fatal for people with compromised immune systems.

“I think one of the things to keep in mind, especially if you’re elderly, if your immune system’s kind of weaker, to avoid getting in the hot tub at all,” Sasson said.

You can read what the CDC says about Legionnaire' disease here: