Some host factors which influence the epidemiology of<i>Taenia multiceps</i>infections in sheep

Herbert, I.V.; Edwards, Gareth; Willis, John M.

doi:10.1080/00034983.1984.11811809

Cited by 28 publications

(18 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The larval stage of T. multiceps causes Coenurosis, a commonly occurring parasitic disease that affects various livestock species worldwide, especially ruminants (Herbert and Edwards 1984). The metacestode, previously known as Coenurus cerebralis, is usually found in the nervous system, including brain and spinal cord in sheep.…”

Section: Introductionmentioning

confidence: 99%

Genetic variation within Taenia multiceps in Sardinia, Western Mediterranean (Italy)

et al. 2006

View full text Add to dashboard Cite

Investigations were undertaken on Taenia multiceps to determine if genetic variation was present within the parasites of Sardinia (Italy). Forty samples were obtained from various locations of Sardinia and deoxyribonucleic acid (DNA) was extracted. Polymerase chain reaction (PCR) was performed on NADH dehydrogenase I (ND1) and cytochrome c subunit 1 (CO1) mitochondrial genes and amplicons were then sequenced and aligned with Bioedit software. Pairwise comparison between the ND1 sequences of the T. multiceps isolates showed differences ranging from 1.27 to 2.54% using an isolate obtained from Wales as an outgroup, while COI sequences showed within the samples coming from Sardinia a lesser degree of variability, ranging from 0.22 to 0.67%. Considering the two genes, it was possible to define at least three specific genetic variants in Sardinian samples, which we have termed Tm1, Tm2, and Tm3. This is the first description of genetic variability in T. multiceps. Further investigations will be required to understand to what extent the genetic variability described in this paper would be reflected also in phenotypic differences.

show abstract

Section: Introductionmentioning

confidence: 99%

Genetic variation within Taenia multiceps in Sardinia, Western Mediterranean (Italy)

et al. 2006

View full text Add to dashboard Cite

show abstract

“…As the cyst increases in size, the clinical signs become more evident including depression, ataxia, circular movements, blindness and head deviation (BUSSELL et al, 1997;ACHENEF et al, 1999). Most infected animals die as a result of starvation within a few weeks (HERBERT et al, 1984). In chronic cases, brain tissue displacement and atrophy occur due to the pressure exerted by mature C. cerebralis cysts, with varying degrees of necrosis and congestion (ACHENEF et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Monitoring of parasitic cysts in the brains of a flock of sheep in Egypt

Anwar

Mahdy

El-Nesr

et al. 2013

Rev. Bras. Parasitol. Vet.

View full text Add to dashboard Cite

Cerebral parasitic cysts constitute a major problem for livestock. Among these, coenurosis and toxoplasmosis are predominant. Here, a total number of 60 sheep obtained from a private farm in Suez province, Egypt, were examined postmortem to detect visible parasitic cysts, and microscopically to detect small-sized entities. Necropsy revealed bladder-like cysts measuring 0.5-6.5 cm in diameter that were filled with a translucent fluid containing a large number of protoscolices. Accordingly, the cysts were identified as the metacestode Coenurus cerebralis. Among the sheep examined, 11 animals (7 males and 4 females) (18.3%) were infected. Most of the cysts were located in the cerebral hemispheres, with numbers ranging from one to three per infected animal. The effect of the presence of cysts in the brain tissue was evaluated. Histopathologically, pseudocysts of the apicomplexan Toxoplasma gondii were found in two animals with no detectable inflammatory cell reactions. In conclusion, coenurosis and toxoplasmosis are serious parasitic problems that play a significant role in sheep management in Egypt, as a result of close contact between livestock and dogs and cats, which play a critical role in the life cycle of these parasites.Keywords: Coenurus cerebralis, Toxoplasma gondii, sheep. ResumoCistos cerebrais parasitários constituem um grande problema para o gado. Entre estes, coenurosis e toxoplasmose são predominantes. Aqui, um número total de 60 ovelhas obtidas em uma fazenda particular na província Suez, Egito, foram examinadas post-mortem para a detecção de cistos parasitários visíveis e microscopicamente para detectar cistos de pequenas dimensões. A necropsia revelou cistos medindo entre 0,5-6,5 cm de diâmetro, preenchidos com um fluido transparente, contendo um grande número de protoscolices. Por conseguinte, os cistos foram identificados como o metacestóide Coenurus cerebralis. Entre as ovelhas examinadas, 11 animais (7 machos e 4 fêmeas) (18,3%) estavam infectados. A maior parte dos cistos estavam localizados nos hemisférios cerebrais, com números variando de um a três em ovinos infectados. O efeito da presença de cistos no tecido do cérebro foi avaliado. Histopatologicamente, pseudocistos de Toxoplasma gondii foram encontrados em dois animais sem reações inflamatórias detectáveis. Em conclusão, coenurosis e toxoplasmose são graves problemas parasitários que desempenham um papel significativo no manejo de ovelhas no Egito, como resultado do contacto íntimo dos animais com os cães e gatos, que desempenham um papel crítico no ciclo de vida desses parasitas.

show abstract

“…History and clinical signs suggested a multifocal or diffuse inflammatory reaction ascribable to the acute phase of coenurosis. Transient pyrexia and nervous dysfunction have been related to the migration of immature metacestode in the brain [16]. MRI and CSF revealed the concurrent presence of meningitis and small cysts, highlighting the transition from acute to the early quiescent phase.…”

mentioning

confidence: 99%

Clinical evolution of cerebral coenurosis from invasive to chronic infection in sheep and a goat

Evangelisti

Varcasia

Deiana

et al. 2016

J Infect Dev Ctries

View full text Add to dashboard Cite

This survey describes the evolution in vivo of Coenurus cerebralis in small ruminants. At presentation, neurological signs and cerebrospinal fluid (CSF) features were suggestive of multifocal or diffuse inflammatory reaction. Magnetic resonance imaging (MRI) captured the transition between the invasive and quiescent phase of the infection, revealing the concurrent presence of meningitis and small cysts. During the quiescent phase, in all animals, neurological symptoms disappeared, and cerebrospinal fluid was unremarkable while cysts grew progressively. Subsequently, the onset of neurological symptoms coincided with MRI signs of diffuse or localized increase of intracranial pressure, as confirmed by direct intracranial pressure measuring. All the animals had an excellent post-surgical recovery. This is the first report describing the evolution of coenurosis in vivo. Sequential imaging allowed describing interesting such as the death of some coenuri and different parasite growth rate in the same host.

show abstract

Some host factors which influence the epidemiology ofTaenia multicepsinfections in sheep

Cited by 28 publications

References 12 publications

Genetic variation within Taenia multiceps in Sardinia, Western Mediterranean (Italy)

Genetic variation within Taenia multiceps in Sardinia, Western Mediterranean (Italy)

Monitoring of parasitic cysts in the brains of a flock of sheep in Egypt

Clinical evolution of cerebral coenurosis from invasive to chronic infection in sheep and a goat

Contact Info

Product

Resources

About