The organisms that cause ringworm, or tinea, use keratin protein as their growth substrate. This is why these infections ________.

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Ringworm or tinea infections are caused by fungi that feed on keratin, a protein found in the outer layers of the skin, hair, and nails. This is why these infections are superficial, affecting only the outermost layers of the skin where keratin is present.

The Organisms That Cause Ringworm, or Tinea, Use Keratin Protein