Avain malaria in Thailand 2. Identification of Plasmodium and pathogenesis of malarial disease in broiler chicken
1996
Tasanee Chompoochan | Sontana Mimapan | Piyanoot Prasitirat (Department of Livestock Development, Bangkok (Thailand). Parasitology Section)
During August-October 1995, 126 blood examination of broilers from 5 poultry farms in Bangkok, Nakhonnayok and Chachoengsao seriously ill with obvious clinical signs of greenish feces, depression, loss of appetite, weakness of legs, ascites, abnormal respiration, severe anemia and death. The tentative diagnosis was presumably due to a haemoprotozoan disease. Laboratory diagnosis was performed from 56 infected chickens, the markedly results revealed Plasmodium gallinaceum in redblood cells, the causative parasite of avian malaria. Morphological identification of various stages of the parasite is ring form, schizonts and gamonts was distinct. Necropsy findings of 50 infected chickens showed hepatomegaly, spleenomegaly, brain congestion and in some cases there were ascites. Microscopic findings revealed centrilobular degeneration and hemosiderosis in the livers, hyperplasia of red pulp and hemosiderosis in the spleens and there were capillaries plugged with erythrocytes infected by some parasites in brain tissue. Electron microscopy demonstrated erythrocytes containing schizonts of malaria.
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