. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . 237 contagious herpes of the horse, almost entirely human. The speciesof T. megahsporon are numerous and fall into several natural groups,the members of which resemble one another both from clinical andmycological aspects (Fig. 93). Cultures inoculated into guinea-pigs andother laboratory animals may produce infection. Achorion Schoenleinii (Favus).—Favus is due to a fungus discoveredby Schoenlein in 1839, and called by Remak Achorion disease is communicated by contagion, the fungu
. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . 237 contagious herpes of the horse, almost entirely human. The speciesof T. megahsporon are numerous and fall into several natural groups,the members of which resemble one another both from clinical andmycological aspects (Fig. 93). Cultures inoculated into guinea-pigs andother laboratory animals may produce infection. Achorion Schoenleinii (Favus).—Favus is due to a fungus discoveredby Schoenlein in 1839, and called by Remak Achorion disease is communicated by contagion, the fungus being oftenderived from animals, especially cats, mice, rabbits, and fowls; dogsalso are subject to it. It grows much more slowly than the ringwormfungus, and is therefore not so quickly transmitted but it will surelyinfect careless, dirty people coming in daily contact with it. Want ofcleanliness is a predisposing factor. The fungus seems to find a morefavorable soil for its development on the skin of persons in weak health,more in those suffering from phthisis than from other Fig. 94.—A portion of a favus-infected hair; magnified. Favus produces tissue irritation of a very chronic course and of greatresistance to treatment. The spores generally find their way into thehair follicles, where they grow in and about the hair (Fig. 94). It growsin the epidermis, the density of the growth causing pressure on the partsbelow, thus crushing out the vitality of the hair and giving rise toatrophic scarring. The disease shows a marked preference for the scalp,but no part of the skin is exempt, and even the mucous membranes arelikely to be attacked. Kaposi has reported a case in which a patientsuffering from universal favus died, with symptoms of severe gastro-intestinal irritation, which was found after death to be due to thepresence of the favus fungus in the stomach and intestines. Fosterreported many cases of favus and ringworm of the nails in the scalp
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