Helminth-Nematode: Ascaris

Dold, Christina; Cv, Holland

doi:10.1016/b978-0-12-378612-8.00141-4

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…in all three layers suggests that either human faeces or pig manure has been deposited in the pond. The Ascaris genus includes several soil transmitted species where the eggs require maturation in the external environment [ 24 ]. The pig ( A .…”

Section: Discussionmentioning

confidence: 99%

Parasitic infections and resource economy of Danish Iron Age settlement through ancient DNA sequencing

et al. 2018

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In this study, we screen archaeological soil samples by microscopy and analyse the samples by next generation sequencing to obtain results with parasites at species level and untargeted findings of plant and animal DNA. Three separate sediment layers of an ancient man-made pond in Hoby, Denmark, ranging from 100 BC to 200 AD, were analysed by microscopy for presence of intestinal worm eggs and DNA analysis were performed to identify intestinal worms and dietary components. Ancient DNA of parasites, domestic animals and edible plants revealed a change in use of the pond over time reflecting the household practice in the adjacent Iron Age settlement. The most abundant parasite found belonged to the Ascaris genus, which was not possible to type at species level. For all sediment layers the presence of eggs of the human whipworm Trichuris trichiura and the beef tapeworm Taenia saginata suggests continuous disposal of human faeces in the pond. Moreover, the continuous findings of T. saginata further imply beef consumption and may suggest that cattle were living in the immediate surrounding of the site throughout the period. Findings of additional host-specific parasites suggest fluctuating presence of other domestic animals over time: Trichuris suis (pig), Parascaris univalens (horse), Taenia hydatigena (dog and sheep). Likewise, alternating occurrence of aDNA of edible plants may suggest changes in agricultural practices. Moreover, the composition of aDNA of parasites, plants and vertebrates suggests a significant change in the use of the ancient pond over a period of three centuries.

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Section: Discussionmentioning

confidence: 99%

Parasitic infections and resource economy of Danish Iron Age settlement through ancient DNA sequencing

et al. 2018

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“…Worse, the eggs that do survive can remain viable in the environment for up to at least 9 years (as cited in [10]). Therefore, Ascaris eggs have been used as indicators for testing the efficiency of wastewater and sludge treatment since they show high resistance towards many chemicals and physical conditions [11].…”

Section: Introductionmentioning

confidence: 99%

Microspheres as Surrogate Helminth Eggs: A Comparative Labscale Sedimentation Study for Tap- and Wastewater

Arthur

Nettmann

Rademacher

et al. 2018

Water

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Re-use of water containing helminth eggs during irrigation for agricultural purposes poses health risks, and likewise during research, due to the potential of spreading on contact. Therefore, polystyrene latex microspheres could be used as surrogates for chemical or biological species during colloidal transport. The aim here is to compare the settling velocities of microspheres having varied surface coatings—that is, proteins A, G and A/G; with that of real helminth eggs obtained from literature. The settling velocities of the microspheres were experimentally determined in tap- and wastewater, as well as theoretically in tap water; which was found to be within the range of mean values for those experimentally determined. There were no differences amongst the microspheres types used for settling in wastewater (i.e., A = 0.072 ± 0.02; G = 0.060 ± 0.03; A/G = 0.053 ± 0.01 mm/s). The same applied for settling in tap water (i.e., A = 0.068 ± 0.02; G = 0.047 ± 0.004; A/G = 0.095 ± 0.02 mm/s), except for microsphere G being different from microsphere A/G. All three types of microspheres settled at velocities lower than that of the wastewater particles (=0.118 ± 0.03). T-test analyses of settling velocities of microspheres in both tap- and wastewater, versus that from literature (i.e., Ascaris, Trichuris and Oesophagostomum), showed that microsphere A and A/G may surrogate for Ascaris in tap water, the same as A/G for Oesophagostomum. In wastewater however, both microspheres A and G are a good fit for Trichuris.

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Spatial and temporal variations in water quality of Todos Santos Bay, northwestern Baja California, Mexico

Tanahara

Canino-Herrera

Durazo

et al. 2021

Marine Pollution Bulletin

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Helminth-Nematode: Ascaris

Cited by 3 publications

References 7 publications

Parasitic infections and resource economy of Danish Iron Age settlement through ancient DNA sequencing

Parasitic infections and resource economy of Danish Iron Age settlement through ancient DNA sequencing

Microspheres as Surrogate Helminth Eggs: A Comparative Labscale Sedimentation Study for Tap- and Wastewater

Spatial and temporal variations in water quality of Todos Santos Bay, northwestern Baja California, Mexico

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