Hillary Clinton's doctor has revealed the 68-year-old has pneumonia, just hours after she was filmed collapsing at the 9/11 memorial service at the World Trade Center.
Dr. Lisa R. Bardack released a statement through Clinton’s campaign team after performing a check-up on the presidential candidate at her home in Chappaqua, New York, on Sunday.
She said: 'Secretary Clinton has been experiencing a cough related to allergies.
‘On Friday, during follow up evaluation of her prolonged cough, she was diagnosed with pneumonia.
‘She was put on antibiotics, and advised to rest and modify her schedule.
'While at this morning's event, she became overheated and dehydrated. I have just examined her and she is now re-hydrated and recovering nicely.'
PEOPLE magazine also revealed several other members of Clinton's staff had also been struck down by the same bug.
"Everyone's been sick," a campaign source tells PEOPLE.
Shocking video footage showed Clinton collapsing into the arms of her Secret Service agents after being rushed from the ceremony at Ground Zero.
A bystander recorded her losing her balance, slumping at the knees and being held up by her aides while waiting to get in a minivan.
Her campaign had earlier blamed 'overheating' for the episode.
At the time the temperature was around 80 degrees and the humidity was low.
Clinton's collapse adds to growing fears for her health, which began mounting on Labor Day when she broke out in a coughing fit during a speech in Ohio.
It now seems that cough has developed into pneumonia, according to Dr Bardack's statement.
Several party leaders and Clinton backers told POLITICO that she needed to offer a fuller accounting of her health.
'There will have to be some kind of accounting for this,' said one former Clinton adviser.
Clinton was already facing calls on Sunday afternoon to release her full medical records.
Despite the concerning footage, she emerged from the home just over two hours later at 11:45am on Sunday saying she was fine.
She told a waiting crowd and reporters: 'I'm feeling great, it's a beautiful day in New York.'
A smiling Clinton was then greeted by a young girl on the street to pose for a picture. She waved at customers at a nearby restaurant before getting into a van.
Clinton then traveled to her home in Chappaqua, New York, according to her campaign.