The Ebola virus becoming airborne is a possible but unlikely outcome in the current epidemic, Centers for Disease Control and Prevention (CDC) Director Tom Frieden said Tuesday.

The outbreak involves Ebola Zaire, a strain that is passed through bodily fluids, not the air. But some experts have expressed fear about viral mutations due to the unprecedented — and rising — number of Ebola cases.

Frieden sought to allay those fears during a call with reporters.

“The rate of change [with Ebola] is slower than most viruses, and most viruses don’t change how they spread,” he said. Frieden is unofficially spearheading the U.S. response to Ebola.

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