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Aspergillosis is a frequent fungal disease in different species of birds and   mammals caused by fungi of the genus Aspergillus. It is characterized by   inflammatory changes primarily in the respiratory system, even though it   sometimes takes on a generalized form when several organ systems are   affected. Mucotic-granulomatous meningoencephalitis with a predominant   localization in the cerebellum has been described in turkeys, ducks and   geese. Within this paper, examinations have been performed on a flock of   broiler turkeys aged 12 days who had sustained evident neurological   disorders in the form of ataxy, torticollis, paresis, and paralysis of the   hind extremities and wings. In three of the ten autopsied chicks the   macroscopic findings indicated granulomatous encephalitis of the cerebellum.   A white-coloured granuloma, around 3mm in diameter, was situated   cranioventrally and was clearly visible on the sagital section of the   cerebellum. Mucological examinations of the cerebellum lesion resulted in   the isolation of the fungi Aspergillus fumigatus. Haematoxylin-eosin (HE),   Grocott and PAS methods were used for the evaluation of histopathological   changes and proving Aspergillus fumigatusa hyphae. The microscopic   examination of brain tissue sections stained with the HE method revealed the   existence of a granuloma with a centrally placed necrotic area. The necrotic   area was infiltrated with heterophilic granulocytes and surrounded by   macrophage, giant cells and lymphocytes. A connective tissue capsule was   located on the periphery of the granuloma. The fungi hyphae, as integral   parts of the granuloma, were difficult to observe, and in some samples   stained using the HE method they could not be seen at all. On the other   hand, sections stanied using the Grocott and PAS methods showed prominent   septed and branched hyphae in different parts of the granuloma. With the   objective of making an etiological diagnosis of mucotic diseases, it is   necessary to apply several histochemical methods, in addition to isolation

Implementation of different histochemical methods in diagnostics of brain Aspergillosis in turkey chicks