An Ohio high school student has lost both his legs to a fast-moving case of a flesh-eating bacteria.

Doctors amputated Blake Haxton's legs above the knees, and a spokesman for Ohio State University Medical Center said the 18-year-old was listed in critical condition Tuesday.

Haxton is the senior captain of the rowing team at Upper Arlington High School in suburban Columbus. More than a week ago, he complained to his coaches about a strained calf muscle.

Doctors say such a minor injury can pave the way into the body for necrotizing fasciitis, an infection that spreads under the skin.

The flesh-eating form of the disease requires antibiotic treatment, but when that doesn't work doctors must remove dead skin, tissue and muscle — and sometimes limbs.