Handbook of medical entomology . e large numbers ofpeople are crowded to-gether under insanitaryconditions and hence itincreases greatly duringwars and is widely dis-seminated and abundantimmediately more commonlyto be met with amongthe lower classes, it notinfrequently appearsamong those of the mostcleanly, careful habits,and it is such cases thatare most liable to wrongdiagnosis by the physi-cian. Infection occurs solely through the passage, direct or indirect,of the young fertilized females to the skin of a healthy adult, oviparous females do not quit their
Handbook of medical entomology . e large numbers ofpeople are crowded to-gether under insanitaryconditions and hence itincreases greatly duringwars and is widely dis-seminated and abundantimmediately more commonlyto be met with amongthe lower classes, it notinfrequently appearsamong those of the mostcleanly, careful habits,and it is such cases thatare most liable to wrongdiagnosis by the physi-cian. Infection occurs solely through the passage, direct or indirect,of the young fertilized females to the skin of a healthy adult, oviparous females do not quit their galleries and hencedo rot serv^e to spread the disease. The young females move aboutmore or less at night and thus the principal source of infestation isthrough sleeping in the same bed with an infested person, or indirectlythrough bedclothes, or even towels or clothing. Diurnal infestationthrough contact or clothing is exceptional. Many cases are knownof the disease being contracted from animals suffering from scabies,or 58. Scpbies on the hand. From portfoHo of Dermo-chromes by permission of Rebman & ofNew York. Publisheis. 76 Parasitic Arthropods When a person is exposed to infestation, the trouble manifestsitself after eight or ten days, though there usually elapses a period of twenty to thirty days be-fore there is a suspicion ofanything serious. The firstsymptom is an intenseitching which increaseswhen the patient is in the point of irrita-tion is examined the gal-leries may usually be seenas characteristic sinuouslines, at first whitish incolor but soon becomingblackish because of the con-tained eggs and galleries, which maynot be very distinct insome cases, may measureas much as four centi-meters in length. Littlevesicles, of the size of apin head are produced bythe secretions of the feeding mite; they are finn, and projecting, andcontain a limpid fluid. Figures 58and 59 show the typical appearanceof scabies on the hands, while figure
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsectp, bookyear1915
