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When riding in the surface cars most of us, no doubt, have inwardly rebelled against touching the transfer tickets handed us by a conductor, who either has just held the entire pad of tickets between his teeth or has smeared the proffered one with his freshly licked fingers. For years I also had regarded this merely as a disgusting trick, but when about two months ago a conductor of markedly phthisical habitus handed me a transfer ticket treated in this manner I thought it worth while to find out whether this nasty practice might not likewise be a dangerous one. Accordingly I at once made a smear from the ticket on a slide which I had with me. On staining this specimen little was to be seen. However, a few mornings later I rode in a car with the same conductor, who, as I now noticed, coughed slightly. The car
HESS AF. CAR CONDUCTORS AS DISSEMINATORS OF TUBERCULOSIS.. JAMA. 1908;L(2):119. doi:10.1001/jama.1908.25310280035004