Revision for “Toxocara canis” created on June 18, 2014 @ 11:29:51

Title
Toxocara canis
Content
<p align="CENTER"><span style="font-size: medium;"><i><b>Toxocara canis</b></i></span></p> <p align="CENTER"><span style="font-size: medium;"><b>(Figures 4-33 through 4-35)</b></span></p> <p align="JUSTIFY"><span style="font-size: medium;"> In 1988, Parsons et al. described a case of disseminated granulomatous disease in a cat that was caused by the larvae of the dog roundworm, </span><span style="font-size: medium;"><i>Toxocara</i></span><span style="font-size: medium;"><i>canis </i></span><span style="font-size: medium;">(Fig. 4-33).</span><span style="font-size: medium;"> The larvae were identified on the basis morphology, being greater in diameter than the 17 </span><span style="font-family: 'WP MathA';"><span style="font-size: medium;"></span></span><span style="font-size: medium;">m of the larvae of </span><span style="font-size: medium;"><i>Toxocara</i></span><span style="font-size: medium;"><i>cati</i></span><span style="font-size: medium;"> whien they appear in tissues. This cat had been housed for 19 days in the research facilities of the School of Veterinary Medicine in Madison, WI, and had been considered normal except for being noted as pyrexiuc throughout the 19-day period. At necrospy, the cat was found to have well delineated, raised g, grey-to-white nodules that were up to 4 mm in diameter within the cortical parenchyma of the kidneys and within the epicardium and myocardium of both ventricles (Fig 4-34). Lesions were also noted on the liver, lungs, spleen, diaphragm, and intestinal serosa. Upon histologic examination, the nodules were found to be large eosinophilic granulomas that contained a larva of </span><span style="font-size: medium;"><i>Toxocara</i></span><span style="font-size: medium;"><i>canis</i></span><span style="font-size: medium;">. In the lungs, medial hypertrophy of the pulmonary vessels was noted along with severe eosinophilic endarteritis (Fig 4-35). Similar lesions have been noted in cats experimentally infected with </span><span style="font-size: medium;"><i>Toxocara</i></span><span style="font-size: medium;"><i>canis</i></span><span style="font-size: medium;"> (Bhowmick, 1964; Parsons, 1989; Swerczek, 1969). In experimentally infected cats, peak eosinophil counts occurred at 25 to 39 days after infection, and challenge infections prolonged the period of increased eosinophilia. In some cats, eosinophils were noted to be up to 50% of the circulating white-blood cells.</span></p> <p align="JUSTIFY"><span style="font-size: medium;"> Lee et al. (1993) reported that the necropsy of 55 cats around Kuala Lumpur, Malaysia, revealed that 15 of these cats were infected with adults of the genus </span><span style="font-size: medium;"><i>Toxocara</i></span><span style="font-size: medium;">. They stated that 12 of the cats were infected with </span><span style="font-size: medium;"><i>Toxocara</i></span><span style="font-size: medium;"><i>cati</i></span><span style="font-size: medium;">, 3 were infected with </span><span style="font-size: medium;"><i>Toxocara</i></span><span style="font-size: medium;"><i>canis</i></span><span style="font-size: medium;">, and that 3 had mixed infections of </span><span style="font-size: medium;"><i>Toxocara</i></span><span style="font-size: medium;"><i>cati</i></span><span style="font-size: medium;"> and </span><span style="font-size: medium;"><i>Toxocara</i></span><span style="font-size: medium;"><i>canis</i></span><span style="font-size: medium;">.</span></p> <p align="JUSTIFY"><span style="font-size: medium;"><b>REFERENCES:</b></span></p> <p align="JUSTIFY"><span style="font-size: medium;">Bhowmick DK. 1964. Deiträge zu dem problem der wanderweg der askaridenlarven (</span><span style="font-size: medium;"><i>Ascaris </i></span></p> <p align="JUSTIFY"><span style="font-size: medium;"><i>lumbricoiudes</i></span><span style="font-size: medium;"> Linné 1758 und Toxocara canis Wener 1782) im experimentellen und natüralichen Wirt.. Zeitschrift für Parasitenkunde 24:121-168.</span></p> <p align="JUSTIFY"><span style="font-size: medium;">Lee CC, Cheng NY, Bohari Y. 1993. </span><span style="font-size: medium;"><i>Toxocara canis</i></span><span style="font-size: medium;"> from domestic cats in Kuala Lumpur. Trop Biomed 10:79-80.</span></p> <p align="JUSTIFY"><span style="font-size: medium;">Parsons JC, Bowman DD, Grieve RB. 1988. Disseminated granulomatous disease in a cat caused by larvae of </span><span style="font-size: medium;"><i>Toxocara canis</i></span><span style="font-size: medium;">. J Comp Path 99:343-346. </span></p> <p align="JUSTIFY"><span style="font-size: medium;">Parsons JC, Bowman DD, Grieve RB. 1989. Pathological and haematological responses of cats experimentally infected with </span><span style="font-size: medium;"><i>Toxocara canis</i></span><span style="font-size: medium;"> larvae. Int J Parasitol 19:479-488.</span></p> <p align="JUSTIFY"><span style="font-size: medium;">Swerczek TW. 1969. Medial hyperplasia of the pulmonary arteries of cats. University Microfilms International, Ann Arbor, MI. 199 pp.</span></p> <p align="JUSTIFY"><span style="font-size: medium;">Figure 4-33. </span><span style="font-size: medium;"><i>Toxocara canis</i></span><span style="font-size: medium;">. Embryonated egg containing a third-stage infective larva.</span></p> <p align="JUSTIFY"><span style="font-size: medium;">Figure 4-34. </span><span style="font-size: medium;"><i>Toxocara canis</i></span><span style="font-size: medium;">. Kidney of an infected cat showing the large eosinophilic granulomas that develop around the larvae of the canine species in this host. </span></p> <p align="JUSTIFY"><span style="font-size: medium;">Figure 4-35. </span><span style="font-size: medium;"><i>Toxocara canis</i></span><span style="font-size: medium;">. Medial hypertrophy of the pulmonary vessels of a specific-pathogen-free cat necropsied 39 days after being experimentally infected with this canine ascarid. Note the highly thickened medial layer of the pulmonary vessel.</span></p>
Excerpt


OldNewDate CreatedAuthorActions
June 18, 2014 @ 11:29:51 Anastasia Bowman
June 17, 2014 @ 21:38:20 Anastasia Bowman