Now Playing: What is hepatitis C?

Now Playing: Pamela Anderson Opens Up About Hepatitis C Cure

Now Playing: NH man and father possibly exposed to HIV by hospital

Now Playing: 3 major US airports to check incoming passengers for potentially deadly virus

Now Playing: 3 major US airports on alert for mystery virus

Now Playing: HIV campaign suspended over raunchy condom packaging

Now Playing: Michael reveals his workout routine

Now Playing: How mom stays in shape in just 20 minutes a day

Now Playing: Rep. Ayanna Pressley opens up about having alopecia

Now Playing: New report shows binge drinking is on the rise

Now Playing: Inside one of the US’s busiest fire stations caring for LA’s homeless residents

Now Playing: New study shows Sepsis kills million more than estimated

Now Playing: Ethan Suplee's incredible weight loss

Now Playing: Meet the incredible hospital worker who reads to pediatric patients

Now Playing: New study finds women’s blood pressure rises higher and faster than men’s

Now Playing: How to make 2020 your best year ever

Now Playing: What women should know about the reproductive system as they age

Now Playing: Man loses over 250 pounds and completes marathon

Now Playing: New study says burnout may lead to irregular heartbeat

Now Playing: How this amputee made history at the Ironman World Championship