A look at Hillary Clinton's recent illness

Democratic presidential candidate Hillary Clinton center accompanied by Sen. Chuck Schumer D-N.Y. left Rep. Joseph Crowley D-N.Y. second from left at top and New York Mayor Bill de Blasio center top attends a cerem

Hillary Clinton's doctor Wednesday declared her "fit to serve" as president, in a health bulletin released a day before she returns to the fray after being grounded by pneumonia at the height of the White House race.

The campaign released two letters: a new letter from Clinton's doctor to supplement the one she released months ago, and a similar note from the doctor of her running mate, Sen.

The letter from Bardack, the chair of internal medicine at CareMount Medical in Mount Kisco, New York, said a chest scan revealed the candidate had "mild, non-contagious bacterial pneumonia".

Almost two decades later, Clinton's desire to work through illness - and penchant for keeping her health secret - has helped cause the most damaging 48-hour period in her presidential campaign and given fresh ammunition to GOP rival Donald Trump.

Bardack said Clinton's cholesterol and blood pressure are within normal ranges.

The billionaire real estate mogul is set talk about his health on "The Dr. Oz Show," being taped Wednesday and set for air on Thursday. Trump has since said that he would release more medical information from a physical he received last week.

But by Sunday morning, Clinton became severely dehydrated during the outdoor 9/11 memorial at Ground Zero, according to the campaign.

The poll, taken September 12 through September 13, shows that eight in 10 (79 percent) said they have heard a lot or some about Clinton's health concerns.

"My overall impression is that Mrs. Clinton has remained healthy and has not developed new medical conditions this year other than a sinus and ear infection and her recently diagnosed pneumonia", Bardack wrote in a letter released to the media.

Clinton had been previously diagnosed with blood clots, and in 2012 while she was secretary of state a clot was discovered in her brain after she suffered a concussion. "I don't think so".

Clinton campaign manager Robby Mook ridiculed Trump's TV appearance.

Obama downplayed questions over Clinton's health, arguing Trump is "not fit in any way" to lead. "And yet because he says it over and over and over again, the press just gives up", Obama said.

Bardack did the right tests for her pneumonia and "she's being treated appropriately", said Dr. Mark Creager, director of the Dartmouth-Hitchkock heart and vascular center in Lebanon, New Hampshire, and a past president of the American Heart Association.

"If you cannot call out bigotry, if you cannot call out racism, xenophobia. if you can't call it out and you stand back and you're silent about it, you're enabling it to grow", Mr Kaine said. The bacteria the vaccines protect against can cause pneumonia, although it's not clear what caused Clinton's pneumonia. Chelsea Clinton would remain on the foundation's board and CHAI, the affiliated health project, would continue to accept corporate and foreign money.

Bardack placed Clinton's condition in the context of a number of recent allergy flairs, "a typical pattern for most of her life". Voters are more likely to say a moderator should correct the participants if they say something untrue than to think that correcting statements is something that should be left to the candidates themselves. As a result, she's taking Levaquin, an antibiotic.

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