Clinical and morphopathological characteristics of an enzootic occurrence of acute coenurosis (Coenurus cerebralis) in a sheep herd

Abstract

In this study, 30 sheep from a flock suddenly showed acute neurological symptoms associated with more than 30 % mortality. At necropsy, thickening associated with congestion and turbidity of meningeal membranes particularly on cerebellum, focal to multifocal necrotic areas and whitish spots measuring 1 to 3 cm in diameter were observed in the cortex of cerebrum and cerebellum. Grossly, numerous white tracts were also observed in the myocardium. Histopathologically, the cross sections of coenurus larvae associated with necrotic suppurative meningoencephalitis were observed. Multiple necrotic areas were also observed in the gray matter of cerebellum due to migration of the larvae with an extensive infiltration of eosinophils and neutrophils. In the heart, multifocal granulomatous myocarditis was diagnosed. No growth was seen in bacterial cultures of the brain and heart. Also, no bacteria were seen in these tissues stained with ZiehlNeelsen and Brown-Brenn Gram stain. On basis of gross and histopathologic lesions, acute coenurosis was diagnosed. Unlike chronic coenurosis, acute form of the disease rarely reported in sheep.

Prevalence, morphological and biochemical study of larval stage Coenurus cerebralis of Taenia multiceps in sheep

“…The study explained that the total infection rate was 22.8%, this result is apparently similar to that obtained by Uslu and Guctu (11) who detected coenurus cyst infection in Istanbul of 24.61%, but higher than that carried out in Abog (12) were recorded 2.68%, and lower than the study done in Ethiopian highland and Egypt which were 75 and 100%, respectively (13,14). This difference in the percentage of infection in several studies may have relationship to different efforts in the system of management, breeding, the amount of contamination of pastures with worm eggs and differences in attempts to control the disease (15).…”

Clinical, pathological and molecular evaluations and CT scan screening of coenurosis (Coenurus cerebralis) in sheep and calves

“…Multiple necrotic areas were also observed in the gray matter of the cerebellum due to the migration of the larvae along with an extensive infiltration of eosinophils and neutrophils. Based on the gross and histopathologic lesions, a diagnosis of acute coenurosis is very rare in sheep (FARJANI KISH et al, 2015). At necropsy, the cysts were found in the telencephalic portion of the right cranial lobe (ACHENEF et al, 1999).…”

Immune Cell Reaction Associated with Coenurus cerebralis Infection in Sheep with Particular Reference to ELISA as a Diagnostic Tool

“…Coenurosis is a devasting problem causing major economic losses in the sheep industry. In Egypt, C. cerebralis has been described as the main infection responsible for the nervous problems of small ruminants [ 11 ] as well as high morbidity and deaths [ 1 , 38 , 39 ], particularly in young sheep.…”

“…Gid (sturdy) is a fatal infection of small ruminants because of C. cerebralis ; the larval stage of Taenia multiceps that infects the small intestines of dogs and wild canids [ 1 ]. C. cerebralis cysts’–the disease’s key player–predilection niche is the central nervous system (CNS) of small ruminants causing ovine coenurosis that is presented in Africa and Asia, with an incidence of 1.3 to 9.8% [ 2 ].…”