This section is from the book "The Home Hand-Book of Domestic Hygiene and Rational Medicine. Volume 2.", by J. H. Kellogg, M.D.. Also available from Amazon: The Home Hand-Book of Domestic Hygiene and Rational Medicine, Volume 2.
SECOND STAGE: After one to three days, fever and other symptoms abate or cease; patient may improve until recovery takes place.
THIRD STAGE: Severity of symptoms reappear, greatly aggravated; jaundice; black vomit; nosebleed; at last, stupor.
This disease has attracted much attention within the last two or three years on account of the terrible epidemics which have almost depopulated some portions of the South. The symptoms above given present but an imperfect picture of the disease, as every case is more or less modified by individual peculiarities, and various other circumstances. The disease seems to vary in different epidemics, in some cases running a mild course, in others, raging with a violence and intensity which sweeps all before it. In addition to the black vomit, due to hemorrhage from the stomach, albumen in the urine, from acute inflammation of the kidneys, is a very grave symptom which is present in the great majority of cases.
Careful investigations of this subject recently made under the auspices of the American Public Health Association, the Yellow Fever Commission, the National Board of Health, and various local sanitary organizations, have resulted in throwing great light upon the nature of this grave malady, although there are many questions of importance which cannot be said to be perfectly settled. There is little room left for doubt, however, as to the contagious nature of the disease, while its infectious character is fully established. It is generally considered as proven that the disease is directly due to infection of the system by a specific germ, although there is still considerable discussion as to whether this germ necessarily originates with the yellow fever pa tient, or may be developed independently under certain unsanitary conditions.