(CBS News) -- In the case of Amber Vinson, the Dallas nurse who flew commercially as she was becoming ill with Ebola, one health official said "somebody dropped the ball."
The Centers for Disease Control and Prevention said that Vinson called the agency several times before flying, saying that she had a fever with a temperature of 99.5 degrees. But because her fever wasn't 100.4 degrees or higher, she didn't officially fall into the group of "high risk" and was allowed to fly.
Officials in the U.S. have been trying to calm fears over the Ebola crisis, but time and again events have overtaken their assurances.
In August, before the first U.S. infection, CDC Director Dr. Tom Frieden said: "We're confident that we have the facilities here to isolate patients, not only at the highly advanced ones like the one at Emory, but really at virtually every major hospital in the U.S."
On Sept. 30, Thomas Duncan tested positive in Dallas.
"This case is serious," Texas Gov. Rick Perry said in reaction. "Rest assured that our system is working as it should."
And there was reassurance from the White House.
"Every hospital in this county has the capability to isolate a patient, take the measures, put them in place to ensure that any suspected case is immediately isolated and the follow-up steps that have been mentioned are immediately taken," Lisa Monaco, a homeland security and counterterrorism adviser to President Obama, said Oct. 3.
But health care workers weren't so sure.