Excerpt: A two-time Miss World finalist has had both of her hands and feet amputated due to a life-threatening infection.

Mariana Bridi of Brazil underwent emergency surgery this week after a viral infection spread to her blood. She remains in serious condition.

The 20-year-old model fell ill on December 30, her boyfriend, Thiago Simoes, told the U.K.'s Daily Mail newspaper. She was first told she had a kidney stone and sent home from the hospital.

Two days later the Brazilian beauty was back in the hospital in the...