The object of the present investigation in Manchuria was to show, first, whether in cases of pneumonic plague pest bacilli become disseminated into the air by the vapor arising from the breath, as in ordinary or in dyspneic respiration, and second, whether the organisms are disseminated by moderate attacks of coughing of pneumonic plague patients in whom the cough does not result in the expulsion of particles of sputum visible to the naked eye. In the course of the experiments on a number of occasions during coughing, small droplets or larger particles of sputum, visible to the eye, were raised and touched the surface of the media on the plate cultures which were exposed before the plague patient. The study of these culture obviously is not included in this investigation. The cultures were invariably exposed before eases of pneumonic plague with bloody sputum, and in which enormous numbers of plague
STRONG RP, TEAGUE O. METHOD OF INFECTION IN PNEUMONIC PLAGUE. JAMA. 1911;LVII(16):1270–1271. doi:10.1001/jama.1911.04260100096009
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