Now Playing: Recovered Ebola Victim 'Thankful to Be Alive'

Now Playing: Ebola Patient Grateful After Surviving 'a Lonely Place'

Now Playing: American Doctor Working in Liberia Tests Positive for Ebola

Now Playing: Tyson Foods Recalls Chicken Nuggets

Now Playing: 10% Happier: Alan Cumming

Now Playing: Beef, Veal, Bison Products Voluntarily Recalled After E. Coli Outbreak

Now Playing: Smoked Salmon Varieties Recalled Over Listeria

Now Playing: Zika Virus Found in Fluid Around Eyes of Adults

Now Playing: '10% Happier': Chef Eric Ripert

Now Playing: Eric Ripert: 'We Shouldn't Be Proud of Chefs Who Are Screaming in the Kitchen'

Now Playing: Half of Kids Spend Time in Homes With Guns But Few Pediatricians Talk Firearm Safety, Study Finds

Now Playing: Eggo Waffles Recalled Over Possible Listeria Contamination

Now Playing: Officials Investigate Leprosy Case in California

Now Playing: Hearing-Impaired Girl Hears Mom's Voice Again After Implant

Now Playing: Study: Early Introduction of Eggs, Peanuts Could Prevent Allergies

Now Playing: Mylan CEO Defends EpiPen Price Hike to Lawmakers

Now Playing: Blue Bell Voluntarily Recalls Select Ice Cream Products Over Listeria Concerns

Now Playing: Bodybuilder With Cerebral Palsy Inspires Millions

Now Playing: Miami Neighborhood Declared Zika-Free

Now Playing: Zika Found in Mosquitoes for 1st Time in US