By Sandra Rose  | 

Chesnot/Getty Images

Former President Bill Clinton is recovering from sepsis in a California hospital, according to reports.

Clinton, 75, was admitted to University of California Irvine Medical Center on Tuesday evening, Clinton spokesman Angel Urena said on Twitter.

Clinton went to the hospital after feeling fatigued (weak and tired). He was diagnosed with sepsis, a serious infection of the bloodstream

Urena said Clinton, who is fully vaccinated, was not diagnosed with Covid-19 and his infection is not heart related.

"He is on the mend, in good spirits and is incredibly thankful to the doctors, nurses, and staff providing him with excellent care," Urena said in a statement.

In a separate statement, Clinton's doctors said his white blood count is decreasing as his infection responds to intravenous antibiotics and IV fluids.

"The California-based medical team has been in constant communication with the President's New York-based medical team, including his cardiologist. We hope to have him go home soon."

Sepsis is a life-threatening infection of the blood that occurs when the immune system is weak, or in people with chronic infections such as pneumonia, kidney or urinary tract infections.

Bacteria can also get into the bloodstream after dental procedures (tooth extraction or dental implants).

Sepsis is not contagious. It can cause multiple organ failure and death if left untreated.

Chip Somodevilla/Getty Images

Clinton, far left, looked pale and weak at the annual 9/11 Commemoration Ceremony at the National 9/11 Memorial and Museum on September 11, 2021 in New York City.

Also pictured are (L-R) former First Lady Hillary Clinton, former President Barack Obama, former First Lady Michelle Obama, President Joe Biden, First Lady Jill Biden and former New York City Mayor Michael Bloomberg.

Theo Wargo/Getty Images

Clinton has a history of cardiac and respiratory illnesses.

In 2004, Clinton underwent quadruple bypass surgery, and in 2005, he underwent surgery for a partially collapsed lung.

In 2010, Clinton complained of chest pains and was admitted to a New York hospital where doctors inserted two coronary stents in his heart.

It isn't clear when Clinton received the mRNA vaccines, or if he received a third booster shot.