Section 6: Extracellular Organisms Microfilaria Trypanosomes Spirochetes Bacteria Microfilaria Distinctive Features: Microfilariae from Dirofilaria immitis or Acanthocheilonema reconditum (Dipetalonema reconditum) are large, extracellular filarial larvae, which have an elongated “wormlike” body. In general, D. immitis (L1) larvae are usually present in high numbers, have a stationary or nonprogressive movement in wet preps, a straight body, a straight tail, and a tapered head. In contrast, A. reconditum larvae generally are few in number, have a progressive movement in wet preps, a curved body, and a blunt head. Differentiation based on microscopic evaluation is difficult, and mixed infections may occur. Diagnostic Significance: The presence of filarial larvae indicates infection with either or both D. immitis or A. reconditum. Plate 6-1 Microfilaria A, Fibrin strand B, Two microfilaria Next Topic Plate 6-1a Plate 6-1b Plate 6-1c Plate 6-1d Plate 6-1e Plate 6-1f Plate 6-1g Plate 6-1h Plate 6-1i Plate 6-1a Return to text. Return to image plate. Plate 6-1b Return to text. Return to image plate. Plate 6-1c Return to text. Return to image plate. Plate 6-1d Return to text. Return to image plate. Plate 6-1e Return to text. Return to image plate. Plate 6-1f Return to text. Return to image plate. Plate 6-1g Return to text. Return to image plate. Plate 6-1h Return to text. Return to image plate. Plate 6-1i Return to text. Return to image plate. Return to text. Return to image plate. Trypanosomes Distinctive Features: Trypomastigotes, the flagellated stage of trypanosomes found in peripheral blood, are large, extracellular protozoa that have an elongated or “blade-shaped” body with an undulating membrane, a tapering posterior end, and a short flagellum directed anteriorly. Diagnostic Significance: The presence of trypanosomes in peripheral blood indicates trypanosomiasis. Trypanosomiasis is a zoonotic disease, and dogs and cats are important reservoirs of infection. In the United States, trypanosomal infection is most often caused by Trypanosoma cruzi (Chagas disease) and is transmitted by biting triatomine bugs, resulting in systemic infection and many variable clinical signs. The predominant clinical manifestation is cardiac disease secondary to myocarditis. Plate 6-2 Trypanosomes< div class='tao-gold-member'> Only gold members can continue reading. Log In or Register to continue Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Related posts: 4: Platelets 1: General Assessment 5: Hematopoietic Neoplasia 3: White Blood Cells Stay updated, free articles. Join our Telegram channel Join Tags: Atlas of Canine and Feline Peripheral Blood Smears Jul 24, 2016 | Posted by admin in SMALL ANIMAL | Comments Off on 6: Extracellular Organisms Full access? Get Clinical Tree
Section 6: Extracellular Organisms Microfilaria Trypanosomes Spirochetes Bacteria Microfilaria Distinctive Features: Microfilariae from Dirofilaria immitis or Acanthocheilonema reconditum (Dipetalonema reconditum) are large, extracellular filarial larvae, which have an elongated “wormlike” body. In general, D. immitis (L1) larvae are usually present in high numbers, have a stationary or nonprogressive movement in wet preps, a straight body, a straight tail, and a tapered head. In contrast, A. reconditum larvae generally are few in number, have a progressive movement in wet preps, a curved body, and a blunt head. Differentiation based on microscopic evaluation is difficult, and mixed infections may occur. Diagnostic Significance: The presence of filarial larvae indicates infection with either or both D. immitis or A. reconditum. Plate 6-1 Microfilaria A, Fibrin strand B, Two microfilaria Next Topic Plate 6-1a Plate 6-1b Plate 6-1c Plate 6-1d Plate 6-1e Plate 6-1f Plate 6-1g Plate 6-1h Plate 6-1i Plate 6-1a Return to text. Return to image plate. Plate 6-1b Return to text. Return to image plate. Plate 6-1c Return to text. Return to image plate. Plate 6-1d Return to text. Return to image plate. Plate 6-1e Return to text. Return to image plate. Plate 6-1f Return to text. Return to image plate. Plate 6-1g Return to text. Return to image plate. Plate 6-1h Return to text. Return to image plate. Plate 6-1i Return to text. Return to image plate. Return to text. Return to image plate. Trypanosomes Distinctive Features: Trypomastigotes, the flagellated stage of trypanosomes found in peripheral blood, are large, extracellular protozoa that have an elongated or “blade-shaped” body with an undulating membrane, a tapering posterior end, and a short flagellum directed anteriorly. Diagnostic Significance: The presence of trypanosomes in peripheral blood indicates trypanosomiasis. Trypanosomiasis is a zoonotic disease, and dogs and cats are important reservoirs of infection. In the United States, trypanosomal infection is most often caused by Trypanosoma cruzi (Chagas disease) and is transmitted by biting triatomine bugs, resulting in systemic infection and many variable clinical signs. The predominant clinical manifestation is cardiac disease secondary to myocarditis. Plate 6-2 Trypanosomes< div class='tao-gold-member'> Only gold members can continue reading. Log In or Register to continue Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Related posts: 4: Platelets 1: General Assessment 5: Hematopoietic Neoplasia 3: White Blood Cells Stay updated, free articles. Join our Telegram channel Join Tags: Atlas of Canine and Feline Peripheral Blood Smears Jul 24, 2016 | Posted by admin in SMALL ANIMAL | Comments Off on 6: Extracellular Organisms Full access? Get Clinical Tree
