The information was not relayed to everyone treating him, so he was sent home.
A team from the CDC is still trying to identify everyone who may have come in contact with the patient.
The death of Beverly Carter is a reminder that most real estate agents are women, and they are disproportionately victimized by violent crime.
Health officials confirmed the first known case in the U.S. on Tuesday.
The district attorney says the attack was revenge for being suspended from work rather than a religious attack.
Nolen was charged Tuesday with first-degree murder and assault.
The head of the Secret Service will testify on Capitol Hill in the wake of recent high-profile lapses.
It is the latest reminder of the dangers real estate agents, who are mostly women, face on the job.
Another tense night in Ferguson.
The wildfire, which has burned across more than 97,000 acres, is 92 percent contained. But recent rains are giving way to warmer, drier weather.