Atlarda protozoal myeloensefalit

Atlarda protozoal myeloensefalit (EPM), Sarcocystis neurona'nm neden olduğu sinirsel bir hastalıktır. Son konak opossumlar olup, atlar sarkokistlerin bulunmamasından dolayı atipik arakonak kabul edilmektedirler. Kedi, rakun, armadillo, su samuru ve kokarcalar arakonaklardır. EPM atlarda özellikle merkezi sinir sistemini etkilemekte; odak tarzında kas atrofisi ve asimetrik yürüyüş bozukluğu gibi çeşitli semptomlara yol açmaktadır. Klinik EPM teşhisinde beyin omurilik sıvısının S. neurona'ya. spesifik antikorlar yönünden Western blot ile muayenesi gerekir. Tedavide sülfadiazin+pirimethamin'in yanı sıra alternatif olarak toltrazuril, ponazuril, diklazuril ve nitazoksanid kullanılır.

Equine protozoal myeloencephalitis

Equine protozoal myeloencephalitis (EPM) is a neurological disease of horses most commonly caused by Sarcocystis neurona. Opossums serve as definitive hosts and horses are considered as aberrant hosts because no sarcocysts are found in horses. Cats, raccoons, armadillos, sea otters and skunks are defined as intermediate hosts. EPM mainly affects the central nervous system of horses and causes a variety of clinical signs including asymmetric gait deficits with focal muscle atrophy. For the clinical diagnosis of EPM, examination of cerebrospinal fluid by Western blot for S. neurona specific antibodies is necessary. Treatment involves the use of sulfadiaz-ine+pyrimethamine and, toltrazuril, ponazuril, diclazuril and nitazoxanide are possible alternatives.

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1. BEECH J, DODD DC. Toxoplasma-like encephalomyelitis in the horse. Vet Pathol. 1974; 11: 87-96. 2. BENTZ BG, EALEY KA, MORROW J, CLAYPOOL PL, SALIKI JT. Seroprevalence of antibodies to Sarcocystis neurona in equids residing in Oklahoma. J Vet Diagn Invest. 2003; 15: 597-600. 3. CHEADLE MA, TANHAUSER SM, DAME JB, SELLON DC, HİNES M, GİNN PE, MACKAY RJ, GREİNER EC. The nine-banded armadillo (Dasypus novemcinctus) is an intermediate host for Sarcocystis neurona. Int J Parasitol. 2001; 31: 330-335. 4. CHEADLE MA, YOWELL CA, SELLON DC, HİNES M, GİNN PE, MARSH AE, MACKAY RJ, DAME JB, GREİNER EC. The striped skunk (Mephitis mephitis) is an intermediate host for Sarcocystis neurona. Int J Parasitol. 2001; 31: 843-849. 5. CUSICK PK, SELLS DM, HAMILTON DP, HARDENBROOK HJ. Toxoplasmosis in two horses. J Am Vet Med Assoc. 1974; 164: 77-80. 6. DİRİKOLU L, LEHNER F, NATTRASS C, BENTZ BG, WOODS WE, CARTER WG, KARPİESİUK W, JACOBS J, BOYLES J, HARKİNS JD, GRANSTROM DE, TOBİN T. Diclazuril in the horse: its identification and detection and preliminary pharmacokinetics. J Vet Pharmacol Ther. 1999; 22: 374-379. 7. DUARTE PC, DAFT BM, CONRAD PA, PACKHAM AE, GARDNER IA. Comparison of a serum indirect fluorescent antibody test with two Western blot tests for the diagnosis of equine protozoal myeloencephalitis. J Vet Diagn Invest. 2003; 15: 8-13. 8. DUBEY JP. Migration and development of Sarcocystis neurona in tissues of interferon gamma knockout mice fed sporocysts from a naturally infected opossum. Vet Parasitol. 2001; 95: 341- 351. 9. DUBEY JP, BLACK SS, RİCKARD LG, ROSENTHAL BM, LİNDSAY DS, SHEN SK, KWOK OC, HURST G, RASHMİR-RAVEN A. Prevalence of Sarcocystis neurona sporocysts in opossums (Didelphis virginiana) from rural Mississippi. Vet Parasitol. 2001; 95: 283-293. 10. DUBEY JP, DAVIS GW, KOESTNER A, KIRYU K. Equine encephalomyelitis due to a protozoan parasite resembling Toxoplasma gondii.J AmVetMedAssoc 1974;165:249-255. 11. DUBEY JP, DAVİS SW, SPEER CA, BOWMAN DD, DE LAHUNTA A, GRANSTROM DE, TOPPER MJ, HAMİR AN, CUMMİNGS JF, SUTER MM. Sarcocystis neurona n. sp. (Protozoa: Apicomplexa), the etiologic agent of equine protozoal myeloencephalitis. J Parasitol. 1991; 77: 212-218. 12. DUBEY JP, KERBER CE, GRANSTROM DE. Serologic prevalence of Sarcocystis neurona, Toxoplasma gondii, and Neospora caninum in horses in Brazil. J Am Vet Med Assoc. 1999 ; 215: 970-972. 13. DUBEY JP, LİNDSAY DS. Isolation in immunodeficient mice of Sarcocystis neurona from opossum (Didelphis virginiana) faeces, and its differentiation from Sarcocystis falcatula. Int J Parasitol. 1998; 28: 1823-1828. 14. DUBEY JP, LİNDSAY DS, KERBER CE, KASAİ N, PENA HF, GENNARİ SM, KWOK OC, SHEN SK, ROSENTHAL BM. First isolation of Sarcocystis neurona from the South American opossum, Didelphis albiventris, from Brazil. Vet Parasitol. 2001; 95: 295-304. 15. DUBEY JP, LİNDSAY DS, SAVİLLE WJ, REED SM, GRANSTROM DE, SPEER CA. A review of Sarcocystis neurona and equine protozoal myeloencephalitis (EPM). Vet Parasitol. 2001; 95: 89-131. 16. DUBEY JP, ROSYPAL AC, ROSENTHAL BM, THOMAS NJ, LİNDSAY DS, STANEK JF, REED SM, SAVİLLE WJ. Sarcocystis neurona infections in sea otter (Enhydra lutris): evidence for natural infections with sarcocysts and transmission of infection to opossums (Didelphis virginiana). J Parasitol. 2001; 87: 1387-1393. 17. DUBEY JP, SAVİLLE WJ, LİNDSAY DS, STİCH RW, STANEK JF, SPEERT CA, ROSENTHAL BM, NJOKU CJ, KWOK OC, SHEN SK, REED SM. Completion of the life cycle of Sarcocystis neurona. J Parasitol. 2000; 86: 1276-1280.

18. DUBEY JP, SAVİLLE WJ, SREEKUMAR C, SHEN SK, LİNDSAY OS, PENA HF, VİANNA MC, GENNARİ SM, REED SM. Effects of high temperature and disinfectants on the viability of Sarcocystis neurona sporocysts. J Parasitol. 2002; 88: 1252-1254. 19. Dubey JP, Saville WJ, Stanek JF, Lindsay DS, Rosenthal BM, Oglesbee MJ, Rosypal AC, Njoku CJ, Stich RW, Kwok OC, Shen SK, Hamir AN, Reed SM. Sarcocystis neurona infections in raccoons (Procyon lotor): evidence for natural infection with sarcocysts, transmission of infection to opossums (Didelphis virginiana), and experimental induction of neurologic disease in raccoons. Vet Parasitol. 2001; 100: 117-129. 20. Dubey JP, Venturini MC, Venturini L, McKinney J, Pecoraro M. Prevalence of antibodies to Sarcocystis neurona, Toxoplasma gondii and Neospora caninum in horses from Argentina. Vet Parasitol. 1999; 86: 59-62. 21. FAYER R, MAYHEW IG, BAİRD JD, DİLL SG, FOREMAN JH, FOX JC, HİGGİNS RJ, REED SM, RUOFF WW, SWEENEY RW, TUTTLE P. Epidemiology of equine protozoal myeloencephalitis in North America based on histologically confirmed cases. A report. J Vet Intern Med. 1990; 4: 54-57. 22. FENGER CK, GRANSTROM DE, GAJADHAR AA, WİLLİAMS NM, MCCRİLLİS SA, STAMPER S, LANGEMEİER JL, DUBEY JP. Experimental induction of equine protozoal myeloencephalitis in horses using Sarcocystis sp. sporocysts from the opossum (Didelphis virginiana). Vet Parasitol. 1997; 68: 199-213. 23. FRANKLİN RP, MACKAY RJ, GİLLİS KD, TANHAUSER SM, GİNN PE, KENNEDY TJ. Effect of a single dose of ponazuril on neural infection and clinical disease in Sarcocystis neurona-challenged interferon-gamma knockout mice. Vet Parasitol. 2003; 114: 123-30. 24. GRANSTROM DE. Equine Protozoal Myeloencephalitis: parasite biology, experimental disease, and laboratory diagnosis. In: Proceedings of the International Equine Neurology Conference 1997, Ithaca, NY, 4. 25. GRANSTROM DE, MACPHERSON JM, GAJADHAR AA, DUBEY JP, TRAMONTİN R, STAMPER S. Differentiation of Sarcocystis neurona from eight related coccidia by random amplified polymorphic DNA assay. Mol Cell Probes. 1994; 8: 353-356. 26. HAMİR AN, MOSER G, GALLİGAN DT, DAVİS SW, GRANSTROM DE, DUBEY JP. Immunohistochemical study to demonstrate Sarcocystis neurona in equine protozoal myeloencephalitis. J Vet Diagn Invest. 1993; 5: 418-422. 27. http://www.epmvaccine.com 28. KATAYAMA Y, WADA R, KANEMARU T, SASAGAWA T, UCHİYAMA T, MATSUMURA T, ANZAİ T. First case report of Sarcocystis neurona-induced equine protozoal myeloencephalitis in Japan. J Vet Med Sci. 2003; 65: 757-759. 29. LİANG FT, GRANSTROM DE, ZHAO XM, TİMONEY JF. Evidence that surface proteins Sn14 and Sn16 of Sarcocystis neurona merozoites are involved in infection and immunity. Infect Immun. 1998; 66: 1834-1838. 30. LİNDSAY DS, DUBEY JP. Direct agglutination test for the detection of antibodies to Sarcocystis neurona in experimentally infected animals. Vet Parasitol.2001;95:179-86. 31. MACKAY RJ. Equine protozoal myeloencephalitis. Vet Clin North Am Equine Pract. 1997; 13: 79-96. 32. MACKAY RJ, DAVIS SW, DUBEY JP. Equine protozoal myeloencephalitis. Comp Cont Educ Pract Vet. 1992; 14: 1359-1367. 33. MARSH AE, BARR BC, MADİGAN J, LAKRİTZ J, NORDHAUSEN R, CONRAD PA. Neosporosis as a cause of equine protozoal myeloencephalitis. J Am Vet Med Assoc. 1996; 209: 1907-1913. 34. MARSH AE, BARR BC, MADIGAN J, LAKRITZ J, CONRAD PA. Sequence analysis and polymerase chain reaction amplification of small subunit ribosomal DNA from Sarcocystis neurona. Am J Vet Res. 1996; 57: 975-981. 35. MARSH AE, HYUN C, BARR BC, TİNDALL R, LAKRİTZ J. Characterization of monoclonal antibodies developed against Sarcocystis neurona. Parasitol Res. 2002; 88: 501-506. 36. MAYHEW IG, DE LAHUNTA A, WHITLOCK RH, POLLOCK RVH. Equine protozoal myeloencephalitis. In: Proceedings of the 22 nd Annual Convention of the American Association of Equine Practitioners. Dallas, TX, Nov-Dec 1976, 107-114. 37. McCLURE SR, PALMA KG. Treatment of equine protozoal myeloencephalitis with nitazoxanide. J. Equine Vet. Sci. 1999; 19: 639- 641 38. MİLLER MM, SWEENEY CR, RUSSELL GE, SHEETZ RM, MORROW JK. Effects of blood contamination of cerebrospinal fluid on western blot analysis for detection of antibodies against Sarcocystis neurona and on albumin quotient and immunoglobulin G index in horses. J Am Vet Med Assoc. 1999; 215: 67-71.

39. PITEL PH, LINDSAY DS, CAURE S, ROMAND S, PRONOST S, GARGALA G, MITCHELL SM, HARY C, THULLIEZ P, FORTIER G, BALLET JJ. Reactivity against Sarcocystis neurona and Neospora by serum antibodies in healthy French horses from two farms with previous equine protozoal myeloencephalitis-like cases. Vet Parasitol. 2003; 111: 1-7. 40. RONEN N. Putative equine protozoal myeloencephalitis in an imported Arabian filly. J S Afr Vet Assoc. 1992; 63: 78-79. 41. ROSSANO MG, KANEENE JB, SCHOTT HC 2ND, SHELINE KD, MANSFIELD LS. Assessing the agreement of Western blot test results for paired serum and cerebrospinal fluid samples from horses tested for antibodies to Sarcocystis neurona. Vet Parasitol. 2003; 115: 233-238. 42. SAVİLLE WJ, MORLEY PS, REED SM, GRANSTROM DE, KOHN CW, HİNCHCLİFF KW, WİTTUM TE. Evaluation of risk factors associated with clinical improvement and survival of horses with equine protozoal myeloencephalitis. J Am Vet Med Assoc. 2000; 217: 1181-1185. 43. SAVİLLE WJ, REED SM, MORLEY PS, GRANSTROM DE, KOHN CW, HİNCHCLİFF KW, WİTTUM TE. Analysis of risk factors for the development of equine protozoal myeloencephalitis in horses. J Am Vet Med Assoc. 2000; 217: 1174-1180. 44. SİMPSON CF, MAYHEW IG. Evidence for Sarcocystis as the etiologic agent of equine protozoal myeloencephalitis. J Protozool. 1980; 27: 288-292. 45. SOFALY CD, REED SM, GORDON JC, DUBEY JP, OGLEEBEE MJ, NJOKU CJ, GROVER DL, SAVİLLE WJ. Experimental induction of equine protozoan myeloencephalitis (EPM) in the horse: effect of Sarcocystis neurona sporocyst inoculation dose on the development of clinical neurologic disease. J Parasitol. 2002; 88: 1164-1170. 46. STANEK JF, DUBEY JP, OGLESBEE MJ, REED SM, LINDSAY DS, CAPITINI LA, NJOKU CJ, VITTITOW KL, SAVILLE WJ. Life cycle of Sarcocystis neurona in its natural intermediate host, the raccoon, Procyon lotor. J Parasitol. 2002; 88: 1151-1158. 47. TİLLOTSON K, MCCUE PM, GRANSTROM DE, DARGATZ DA, SMİTH MO, TRAUBDARGATZ JL. Seroprevalence of antibodies to Sarcocystis neurona in horses residing in northern Colorado. J Equine Vet Sci. 1999; 19: 122-126. 48. TURAY HO, BARR BC, CALDWELL A, BRANSON KR, COCKRELL MK, MARSH AE. Sarcocystis neurona reacting antibodies in Missouri feral domestic cats (Felis domesticus) and their role as an intermediate host. Parasitol Res. 2002; 88: 38-43. 49. WEIGAND K, GRABNER A. Equine protozoaere Myeloenzephalitis bei einem importierten Paint- Horse. Pferdeheilkunde 1997; 13: 231-235. 50. WİTONSKY SG, GOGAL RM JR, DUNCAN RB, LİNDSAY DS. Protective immune response to experimental infection with Sarcocystis neurona in 57BL/6 mice. J Parasitol. 2003; 89: 924-931.