Some factors affecting the eggs of<i>Taenia multiceps</i>: their transmission onto pasture and their viability

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

doi:10.1080/00034983.1984.11811808

Cited by 17 publications

(19 citation statements)

References 10 publications

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“…The metacestode, previously known as Coenurus cerebralis, is usually found in the nervous system, including brain and spinal cord in sheep. The presence of cysts typically leads to neurological symptoms that, in the majority of cases, lead the animal to die after some weeks from starvation (Willis and Herbert 1984).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2006

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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.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2006

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“…In terms of temperature, eggs have recorded to withstand freeing conditions of up to À20°C without any effect on hatching (Willis and Herbert, 1984), while surviving for just 4 days at 21°C (Gemmell, 1977) and for just a few hours, if at all at 37°C (Coman, 1975;Gemmell, 1977). In terms of humidity and surface water, the evidence suggests that conditions of low RH can dramatically affect the survival of eggs.…”

Section: Taeniasis-cysticercosismentioning

confidence: 99%

“…In common with other parasites, the majority of work related to the natural history of taenid eggs was comprehensively investigated several decades ago (reviewed Lawson and Gemmell, 1983; see also Willis and Herbert, 1984 regarding Taenia multiceps). The aim of these studies was to understand the abiotic and biotic factors that affect the survival of eggs either under in vitro or field conditions, covering a range of species including Taenia pisiformis, Taenia ovis, Taenia hydatigena and T. multiceps.…”

Section: Taeniasis-cysticercosismentioning

confidence: 99%

Climate Change and the Neglected Tropical Diseases

Booth

2018

Advances in Parasitology

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Climate change is expected to impact across every domain of society, including health. The majority of the world's population is susceptible to pathological, infectious disease whose life cycles are sensitive to environmental factors across different physical phases including air, water and soil. Nearly all so-called neglected tropical diseases (NTDs) fall into this category, meaning that future geographic patterns of transmission of dozens of infections are likely to be affected by climate change over the short (seasonal), medium (annual) and long (decadal) term. This review offers an introduction into the terms and processes deployed in modelling climate change and reviews the state of the art in terms of research into how climate change may affect future transmission of NTDs. The 34 infections included in this chapter are drawn from the WHO NTD list and the WHO blueprint list of priority diseases. For the majority of infections, some evidence is available of which environmental factors contribute to the population biology of parasites, vectors and zoonotic hosts. There is a general paucity of published research on the potential effects of decadal climate change, with some exceptions, mainly in vector-borne diseases.

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“…Canids and rarely other carnivores are the definitive hosts harbouring adult tapeworms in the intestine (Table 1). Tapeworms mature within 15–42 days, with 3–4 proglottids shed daily containing more than 35,000 eggs per proglottid (Willis and Herbert, 1984). For T. multiceps it was shown that most eggs are released already from the proglottis in the intestine of the final host (Herbert et al, 1984; Scala and Varcasia, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Each of the described tapeworm species usually infects a specific range of intermediate hosts (Table 1). After spreading of the oncosphere through the blood system, a vesicle-shaped cyst develops as coenurus, containing a few to several hundred protoscolices (Lescano and Zunt, 2013; Willis and Herbert, 1984).…”

Section: Introductionmentioning

confidence: 99%

Wildlife-transmitted Taenia and Versteria cysticercosis and coenurosis in humans and other primates

Deplazes

Eichenberger

Grimm

2019

International Journal for Parasitology: Parasites and Wildlife

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Wild mustelids and canids are definitive hosts of Taenia and Versteria spp. while rodents act as natural intermediate hosts. Rarely, larval stages of these parasites can cause serious zoonoses. In Europe, four cases of Taenia martis cysticercosis have been diagnosed in immunocompetent women, and two cases in zoo primates since 2013. In North America, a zoonotic genotype related but distinct from Versteria mustelae has been identified in 2014, which had caused a fatal infection in an orangutan and liver- and disseminated cysticercoses in two severely immune deficient human patients in 2018, respectively. Additionally, we could attribute a historic human case from the USA to this Versteria sp. by reanalysing a published nucleotide sequence. In the last decades, sporadic zoonotic infections by cysticerci of the canid tapeworm Taenia crassiceps have been described (4 in North America, 8 in Europe). Besides, 3 ocular cases from North America and one neural infection from Europe, all in immunocompetent patients, 6 cutaneous infections were described in severely immunocompromised European patients. Correspondingly, besides oral infections with taeniid eggs, accidental subcutaneous oncosphere establishment after egg-contamination of open wounds was suggested, especially in cases with a history of cutaneous injuries at the infection site. Taenia multiceps is mainly transmitted in a domestic cycle. Only five human coenurosis cases are published since 2000. In contrast, T. serialis coenurosis (1 human case since 2000) is primarily transmitted by wild canids. The etiological diagnosis of exotic cysticercoses is challenging. Usually, clinical material does not allow for a morphological identification, and serological tests are not available. These limitations have partly been overcome by molecular tools. Without claiming any dramatic emergence of cysticercoses and coenuroses transmitted by wild carnivores, further sporadic cases of such ‘exotic’ infections have to be expected.

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Some factors affecting the eggs ofTaenia multiceps: their transmission onto pasture and their viability

Cited by 17 publications

References 10 publications

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

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

Climate Change and the Neglected Tropical Diseases

Wildlife-transmitted Taenia and Versteria cysticercosis and coenurosis in humans and other primates

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