Herman Cain speaks in Washington on June 20, 2014. Last year, the president nominated Cain to a seat on the Federal Reserve Board, the US central bank, but Cain withdrew after opposition mounted against him.
He had been treated for COVID=19 less than two weeks after attending President Donald Trump's campaign rally in Tulsa, Oklahoma, in June.
Cain was admitted to an Atlanta, Georgia area hospital on July 1, after testing positive for SARS-CoV-2 several days prior.More news: Federal COVID-19 app launches after month-long delay
In a detailed statement about his battle with the virus, Dan Calabrese, an editor of Cain's website, reported that Cain had struggled "trouble breathing" and had been taken to the hospital by ambulance about a month ago. "I'm concerned about our ability to protect anyone who attends a large, indoor event, and I'm also concerned about our ability to ensure the president stays safe, as well".
Mr Cain said he returned the franchise to profitability.
He ran for president in 2012, briefly leading in the Republican Party polls during the primaries.More news: Private Division signs deals with Roll7, Moon Studios and League of Geeks
During his presidential run in 2012, Cain grew notorious for his "9-9-9: tax reform plan" that called to replace current taxes with a 9 percent personal income tax, a 9 percent business transactions tax and a 9 percent federal sales tax.
But his campaign was brought undone by sexual misconduct allegations in November of 2011. He graduated from the historically Black Morehouse College in 1967 with a degree in mathematics, and from Purdue University in IN in 1971 with a master's in computer science.
"The past two days, we've had nearly 500 cases, and we know we had several large events a little over two weeks ago, which is about right", the doctor said.
Cain was back in the national eye in April 2019, when Trump said he meant to nominate him for one of the vacant seats on the Federal Reserve Board.More news: Russia Aims for COVID-19 Vaccine by Mid-August
Cain is survived by his wife, Gloria Etchison, whom he married in 1968, and two children.