pneumonia diagnosis

US Democratic party presidential candidate Hillary Clinton

US Democratic party presidential candidate Hillary Clinton kept her pneumonia diagnosis from most of her staff, according to reports, choosing to tell only family and close aides.

Mrs Clinton was reportedly concerned that news of the illness would be exploited by her opponents.

She was diagnosed on Friday and advised to rest, but continued campaigning.

Her team was forced to go public with the diagnosis on Sunday when she left a 9/11 memorial early, appearing weak.