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The plague is very properly divided into three types: the bubonic, or that from affecting the lymphatic system which is usually the most common type; the septicemic, or that affecting the blood-system; and the pneumonic type, or that affecting the lungs more especially. The latter two types are usually most fatal.
The epidemic which was, in January, 1911, overrunning North China was of this last type—the pneumonic type—largely and of excessive virulence; although there were, as in all epidemics of this disease, some cases of the other two types, and more of the septicemic type than of the bubonic type. So far as our experience here is concerned—and that experience is confirmed by reports coming from other infected regions—scarcely any who have taken the disease have recovered.
The disease, so reports have it, has been found in sporadic cases, and even in small epidemics in southern Russia for several months,
MULLOWNEY JJ. THE PLAGUE IN NORTH CHINA. JAMA. 1911;LVI(10):737. doi:10.1001/jama.1911.02560100029011