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Recurring Histomonosis on an Organic Farm

C. Popp, R. Hauck, S. Balczulat and H. M. Hafez
Avian Diseases
Vol. 55, No. 2 (June 2011), pp. 328-330
Stable URL: http://www.jstor.org/stable/41319341
Page Count: 3
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Recurring Histomonosis on an Organic Farm
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Abstract

This report describes outbreaks of histomonosis, a severe disease caused by the protozoan parasite Histomonas meleagridis, which occurred over a period of 3 yr on an organic farm in southern Germany. Among other species, the farm houses layers, broilers, and turkeys. In August 2005 one group of turkeys was naturally infected with H. meleagridis. The strain causing infection was typed by C-profiling as genotype B. A second outbreak occurred 3 yr later. Again, a group of turkeys was naturally infected. The strain causing the infection belonged to genotype A. Two months later one group of broilers became infected with H meleagridis type  and a group of turkeys with H. meleagridis type A. Four weeks later two further groups of broilers showed symptoms. DNA of H. meleagridis was detected but genotyping was not possible. In conclusion, genotyping of the histomonal strains causing the disease showed that at least two different histomonal strains caused the outbreaks and that the strains circulated on the farm at the same time. Este reporte describe los brotes de histomoniasis, una enfermedad severa causada por el protozoário parasito Histomonas meleagridis, que ocurrieron sobre un periodo de tres anos en una granja de aves orgânicas en la parte sur de Alemania. Entre otras espécies, la granja alojaba gallinas de postura, pollos de engorde, y pavos. En agosto del 2005, un grupo de pavos se infecto naturalmente con H. meleagridis. La cepa que causaba la infección se tipifico como un genotipo B por el método de perfiles C. Un segundo brote ocurrió tres anos después. Nuevamente, un grupo de pavos se infecto de manera natural. La cepa que causaba Ia infección pertenecía al genotipo A. Dos meses después un grupo de pollos de engorde se infecto con H. meleagridis tipo B y un grupo de pavos se infecto con H. meleagridis tipo A. Cuatro semanas después, dos grupos más de pollo de engorde mostraron signos. Se detecto el ADN de H. meleagridis pero no fue posible la genotipificación. En conclusion, la genotipifìcación de las cepas de histomonas que causan enfermedad mostro que al menos dos diferentes cepas causaron los brotes y que las cepas circularon en la granja al mismo tiempo.

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