Dr. Oz says the most common cause of this flesh-eating bacteria is streptococcus, the strain that causes strep throat.
Tanya's medical nightmare may have stemmed from a co-worker who brought strep into the kitchen.
"They [may have] coughed on you. They sneezed, [and] it got on the knife," Dr. Oz says. "The knife cuts a little deeper than usual, so now the bacteria has a way of getting down into the muscle."
Unfortunately, Dr. Oz says 75 percent of people who are infected with this rare bacteria don't survive to tell their stories. To prevent this from happening, Dr. Oz encourages you to be assertive with your doctors and do what your mother taught you...wash your hands! "It's the most fundamental message," he says.