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Pathogenicity of Turkey Coronavirus in Turkeys and Chickens

M. M. Ismail, Y. Tang and Y. M. Saif
Avian Diseases
Vol. 47, No. 3 (Jul. - Sep., 2003), pp. 515-522
Stable URL: http://www.jstor.org/stable/1593125
Page Count: 8
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Pathogenicity of Turkey Coronavirus in Turkeys and Chickens
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Abstract

We designed this study to compare the replication potential of turkey coronavirus (TCV) and its effect in chickens and turkeys and to study the effect of single and combined infection of turkey poults with TCV and astrovirus. We studied the pathogenicity of TCV in experimentally inoculated turkey poults and chickens by observing the clinical signs and gross lesions. Two trials were conducted with 1-day-old and 4-wk-old specific-pathogen-free turkey poults and chickens. One-day-old turkey poults developed diarrhea at 48 hr postinoculation. Poults euthanatized at 3, 5, and 7 days postinoculation had flaccid, pale, and thin-walled intestines with watery contents. The 4-wk-old turkeys had no clinical signs or gross lesions. One-day-old and 4-wk-old chicks developed no clinical signs or gross lesions although the TCV was detected in gut contents of the birds throughout the experimental period (14 days). In another experiment, mean plasma D-xylose concentrations in 3-day-old turkey poults inoculated with TCV, turkey astrovirus, or a combination of both viruses were significantly lower than in the uninoculated controls. /// Se diseñó un estudio para comparar el potencial de replicación del coronavirus del pavo y su efecto en pollos y en pavos y estudiar el efecto en pavipollos de una infección sola o combinada con el coronavirus del pavo y astrovirus. Se estudió la patogenicidad del coronavirus del pavo en pavipollos y pollos inoculados experimentalmente mediante la observación de los signos clínicos y las lesiones macroscópicas. Se realizaron dos ensayos en pavipollos y pollos libres de patógenos específicos de 1 día y 4 semanas de edad. Se observó diarrea en los pavipollos de un día de edad a las 48 horas posteriores a la inoculación. Se observó flacidez, palidez y adelgazamiento de la pared intestinal con contenidos acuosos en los pavipollos sacrificados a los 3, 5 y 7 días posteriores a la inoculación. No se observaron signos clínicos ni lesiones macroscópicas en los pavos de 4 semanas de edad. No se observaron signos clínicos ni lesiones macroscópicas en los pollos de 1 día y 4 semanas de edad, sin embargo, se aisló el coronavirus del pavo a partir de los contenidos del tracto intestinal de las aves durante el tiempo de duración del experimento (14 días). En otro experimento se observaron niveles promedio significativamente menores de concentración de D-xilosa en plasma en pavipollos de 3 días de edad inoculados con el coronavirus del pavo, astrovirus del pavo o con ambos virus al ser comparados con los niveles de los controles no inoculados.

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