. Handbook of medical entomology. Insect pests; Insects as carriers of disease; Medical parasitology. 76 Parasitic Arthropods When a person is exposed to infestation, the trouble manifests itself after eight or ten days, though there usually elapses a period of twenty to thirty days be- fore there is a suspicion of anything serious. The first symptom is an intense itching which increases when the patient is in bed. When the point of irrita- tion is examined the gal- leries may usually be seen as characteristic sinuous lines, at first whitish in color but soon becoming blackishbecauseof the con
. Handbook of medical entomology. Insect pests; Insects as carriers of disease; Medical parasitology. 76 Parasitic Arthropods When a person is exposed to infestation, the trouble manifests itself after eight or ten days, though there usually elapses a period of twenty to thirty days be- fore there is a suspicion of anything serious. The first symptom is an intense itching which increases when the patient is in bed. When the point of irrita- tion is examined the gal- leries may usually be seen as characteristic sinuous lines, at first whitish in color but soon becoming blackishbecauseof the con- tained eggs and excrement. The galleries, which may not be very distinct in some cases, may measure as much as four centi- meters in length. Little vesicles, of the size of a pin head are produced by the secretions of the feeding mite; they are firm, and projecting, and contain a limpid fluid. Figures 58 and S9 show the typical appearance of scabies on the hands, while figure 60 shows a severe general infesta- tion . The intolerable itching induces scratching and through this various complications may arise. The lesions are not normally found on the face and scalp, and are rare on the back. Formerly, scabies was considered a very serious disease, for its cause and method of treatment were xm- known, and potentially it may con- tinue indefinitely. Generation after generation of the mites may develop and finally their number become so ^°- ^StS MOTrow^'"™ °' ^'^'''"-. 59. Scabies on the hand. After Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Riley, William A. (William Albert), b. 1876; Johanssen, Oskar Augustus, 1870-. Ithaca, N. Y. , The Comstock Publishing Company
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