The 65-year-old Clinton, who's expected to leave her job soon after serving as America's top diplomat during President Barack Obama's first term, is recovering at home after the incident last week and is being monitored by doctors, according to a statement by aide Philippe Reines.
No further details were immediately available.
The statement said Clinton was dehydrated because of the virus and that she fainted and sustained a concussion. She will continue to work from home in the week ahead and looks forward to being back in the office "soon," the statement said.
Congressional aides do not expect her to testify as scheduled at congressional hearings on Thursday into the Sept. 11 attack against a U.S. diplomatic outpost in Benghazi, Libya, that killed four Americans, including the U.S. ambassador.
How convenient that she's not expected to testify as scheduled.....