Stringy particles of Ebola virus (blue) bud from a chronically infected cell (yellow-green) in this colorized, scanning electron micrograph. NIAID/Science Source hide caption

itoggle caption NIAID/Science Source

This undated photo of Eric Frein was released Tuesday by Pennsylvania State Police. Frein, 31, had been sought in connection with September's killing of a state trooper and the critical wounding of another. AP hide caption

itoggle caption AP

Gary Morse, with wife Sharon, in 1999. Morse transformed a mobile home park in Florida into The Villages, a retirement community of more than 100,000 residents. Stephen M. Dowell/Orlando Sentinel hide caption

itoggle caption Stephen M. Dowell/Orlando Sentinel

Don't look for leading Ebola researchers at the Sheraton New Orleans. Louisiana health officials told doctors and scientists who have been in West Africa not to come to a medical meeting in town. Prayitno/Flickr hide caption

itoggle caption Prayitno/Flickr