Chest x-ray of a patient with tuberculosis.
In this chest X-ray of a person with advanced tuberculosis, the infections in both lungs are marked by white arrowheads and the formation of a cavity is marked by black arrows. The boundary between contagious and non-contagious infectious diseases is not perfectly drawn, as illustrated by tuberculosis, which is clearly transmissible from person to person, but was not classically considered a contagious disease.
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"Tuberculosis-x-ray-1."
http://en.wikipedia.org/wiki/File:Tuberculosis-x-ray-1.jpg
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