MAREK'S DISEASE

Abstract

This analysis carried out, between 2023 and 2024, presents a histopathology study of Marek's disease observed in the East of Algeria more specifically in Constantine among two types of breeding, the municipality of Ibn-Badis (formerly El Haria) and the municipality of Ouled Rahmoune, one of broiler chickens and the other of laying hens. The disease reappeared at the broiler chickens aged of 35 days and progressed along 17 days causing a mortality of 6% in total, whereas at the laying hens, it had touched the animals aged of 24 weeks and progressed along 14 weeks causing a mortality of 16.7%. In the two types of breeding, there are whitish tumour seepages very revealing of the Marek's disease associated to a hypertrophia very marked of affected organs particularly the liver, the spleen, the kidneys, the ovarian cluster, the bursa of Fabricius and thymus, also there are subcutaneous tumours under the base of wounds with hypertrophia, nerve damages and cases of death had suddenly appeared. Our results show that the re-emergence of this disease is characterised by the formation of cellular lymphosarcomas (lymphomas) with paralysis.