Diagnostic methods, chemical, bacteriological and microscopical : a text-book for students and practitioners . ing its nourishment in the blood of its victims. This parasite is reddish-brown in color, oval in shape, from 4 to 5 mm, in length and 3 mm. in breadth. These insects, if crushed between slides or as more usual between the hand and a part of the victims body have a PARASITES. 155 characteristic odor very much resembling kerosene. The blood is drawn fromthe victim by means of a long proboscis. The eggs are approximately in length and require about 11 months for their developmen
Diagnostic methods, chemical, bacteriological and microscopical : a text-book for students and practitioners . ing its nourishment in the blood of its victims. This parasite is reddish-brown in color, oval in shape, from 4 to 5 mm, in length and 3 mm. in breadth. These insects, if crushed between slides or as more usual between the hand and a part of the victims body have a PARASITES. 155 characteristic odor very much resembling kerosene. The blood is drawn fromthe victim by means of a long proboscis. The eggs are approximately in length and require about 11 months for their development to thesexually ripe insect. These eggs are retained in the crevices of the bed, floors,furniture, wall-paper, and other parts of the dwelling so that the completeremoval of these eggs and parasites is a matter of some difficulty. That these insects have more or less importance from the standpointof transmission of disease from one person to another must be vary in their susceptibility to the bite of the bed-bud, some beingindifferent to it while others are markedly affected by Fig. 62.—Pulex irritans: X 14. {Tyson after Braun.) (b). Diptera.(i). Pulex irritans (Common Flea). The male is from 2 to mm. in length, the female as much as 4 is a red or brownish-red insect, having a laterally compressed body, an oralhaustellum, serrated soft mandibles, a tongue sheathed in an inferior labium,and a pair of labial four-jointed palpi. Each of the triple segments of thethorax bears a pair of five-jointed double-clawed legs. The female depositsher eggs, not on the human being, fortunately, but in the fissures, crevices,or holes of garments or furniture which may be accessible. (2). Pulex penetrans (Sand-flea or Jigger). This parasite is a minute, brownish-red, egg-shaped insect which penetratesthe skin of man. The female is the infecting insect and produces painfulirritation and even suppuration. Vegetable Parasites. (i). Achorion Schonleinii. This
Size: 1747px × 1430px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectdiagnosis, bookyear19
