University:
College
Course:
College Rehabilitation Medicine
Academic year:

2023
Views:

15

Pages:

10
Author:

Ramy S

Parasites of Skin and musculoskeletal system Section By Dr Asmaa kamal Lecturer of medical parasitology Faculty of medicine Parasitic Skin & Muscle infections SKIN •Cercarial dermatitis •SC sparganosis •Cutaneous larva migrans •Cutaneous amebiasis •Cutaneous leishmaniasis •Cutaneous myiasis •Scabies MUSCLEMUSCLE •Trichinellosis CERCARIAL DERMATITIS Cercaria-Morphology Body & tail. Furcocercous. 400-600 μm long. Clinical sign CERCARIAL DERMATITIS Causative parasite Furocercus cercaria of non human Schistosoma SPARGANOSIS The sparganum morphology • Is a wrinkled,white,ribbon shaped organism,has an unsegmented strobila20to30cminlength. • Solidlarva. • Has bothrids(twolongitudinalgrooves)at the anterior end. Identify the parasite Sparganum of Diphyllobothrium mansoni and proliferum CUTANEOUS LARVA MIGRANS • Cutaneous larva migrans (CLM) ,also called creeping eruption. • Skin penetration by infective filariform larvae of Ancylostoma brazilienses ,A.caninum from the soil,produce pruritic papules,which after several days become linear tracks Clinical sign Cutaneous larva migrans (CLM) ,also called creeping eruption. Causative parasite filariform larvae of Ancylostoma brazilienses ,A.caninum E. histolytica trophozoitesMorphology Have a sharply defined cell membrane, Ameboid shape, a single prominent pseudopodwith active purposeful directional motion. Finely granular vacuolated cytoplasm, A single vesicular nucleus, 2 to 4 μm in diameter with a small centric karyosome. Phagocytized red blood cellsmay be seen in the cytoplasm. Clinical sign Amebiasis cutis Causative parasite Entamoebia histolytica Identify the parasite Entamoeba histolytica trophozoites Clinical sign Cutaneous leishmaniasis Causative parasite Leishmania tropica or major Identify the parasite Leishmania amastigotes stage Cutaneous MYIASIS •Cutaneous (furuncular)myiasis, infestation of live human skin with dipterous fly larvae . Clinical sign Myiasis Causative parasite Dipterious fly larvae Scabies • Adult scabies mites are spherical, with 4 pairs telescoped legs.[ • No demarcation into cephalothorax or abdomen occurs. • The male has suckers on all legs except the third pair, which distinguishes it from the female Identify the parasite Sarcoptes scabiei Clinical sign Scabies Causative parasite Sarcoptes scabiei Trichinella spiralis. Encysted larva in muscle: o Spindle-shaped cyst ½ X ¼ mm. o Cysts are along the longitudinal axis of muscle fibers. o Each cyst contains usually one coiled larva. Causative parasite Trichinella spiralis larvae encysted in muscle tissue