Update at 5:20 p.m. — The woman who vomited on a tour bus near the Pentagon Friday morning and set off quarantines across the region does not have Ebola, Fairfax and Arlington health department officials said Friday evening.

“Based on the public health investigation, which included the travel history of a woman who became ill this morning in a Pentagon parking lot, and on questioning of her by medical staff, medical authorities are confident that she does not have Ebola,” officials said in a statement.

(Updated at 5:00) A woman vomiting on a tour bus near the Pentagon Friday morning is being evaluated for possible symptoms of Ebola at Fairfax Inova Hospital.

County health officials said the woman is being kept in isolation while they get information about her health and travel history. Local health departments are working to find every person who had contact with the woman.

“The patient was immediately isolated and is undergoing triage in consultation with the Fairfax County Health Department,” Inova said in a statement. “Based upon that evaluation, a decision will be made by the health department as to whether the patient meets the criteria to be tested for the Ebola virus.”

The Centers for Disease Control will determine whether the woman should be tested for Ebola, Fairfax County Health Department officials said about 3 p.m.

The woman, whose age was not released, became ill on a tour bus in the Pentagon’s south parking lot about 9:10 a.m. Friday, according to a statement from Arlington County. When medics learned she had recently arrived from Africa, a hazardous materials team was called out of “a complete abundance of caution,” Pentagon Force Protection Agency spokesman Chris Layman told ARLnow.com.

The woman was initially taken to Virginia Hospital Center but did not exit the ambulance. The Arlington County Fire Department then transported her to Fairfax Inova Hospital, Arlington officials said. A news chopper photographer posted photos of emergency vehicles and an orange protective tent outside the 3300 Gallows Rd. hospital about 12:15 p.m.

We are aware of the possible #Ebola patient taken to Inova Fairfax Hospital. We are actively monitoring the situation. — FairfaxCounty Health (@fairfaxhealth) October 17, 2014

The possible Ebola patient is currently in isolation while confirmation of her travel history and medical condition are being conducted. — FairfaxCounty Health (@fairfaxhealth) October 17, 2014

Health Depts. around the region are now mobilizing to locate individuals who may have had contact with the patient. Updates TK. — FairfaxCounty Health (@fairfaxhealth) October 17, 2014

UPDATE: @CDCgov has been contacted by @VDHgov to determine whether testing of this individual is warranted. http://t.co/2ju9Ee2lo9 — FairfaxCounty Health (@fairfaxhealth) October 17, 2014

Two officials with knowledge of the incident, plus the woman’s boss at a public relations firm, said they do not believe the patient had recently traveled outside the U.S., The Washington Post reported. Rather, the woman was suffering from a “severe illness” and might have boarded the wrong bus, her boss said.

The bus the woman briefly rode was quarantined for four hours near Barracks Row in D.C. and D.C. police closed an entire block, the Post reported. D.C. Department of Health officials told U.S. Marines and others on board — who had no contact with the woman — to take their temperatures twice a day for the next three weeks and report any irregularities.

An Inova representative said Thursday that he was “absolutely confident” the facility could treat Ebola patients. Officials said then that they planned to open a separate Ebola unit next week.

A Loudoun county inmate who had recently traveled in West Africa was taken to Inova Loudoun Hospital on Thursday after she was found to have a low-grade fever, the Post reported. The middle-aged woman “didn’t meet the threshold for Ebola testing,” the hospital said in a statement Friday morning. “All safety precautions and protocols were in place” at the Loudoun hospital, they said.