Chapter 1 The Biology of the Caecal Trematode Zygocotyle lunata

Fried, Bernard; Huffman, Jane E.; Keeler, Shamus P.; Peoples, Robert C.

doi:10.1016/s0065-308x(09)69001-1

Cited by 15 publications

(13 citation statements)

References 61 publications

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“…The 2 specimens from D. viduata and the single specimen from D. bicolor (found in the intestine) had no eggs, and were smaller than adults from mice and chicks 35 days PE. Shostak et al;1993;Nollen, 1994;Reddy and Fried, 1997), whereas the information on larval stages is scarce and mainly limited to the metacercaria (Fried et al, 2009).…”

Section: Resultsmentioning

confidence: 99%

“…In addition, it can be easily obtained experimentally from laboratory-reared animals (ducks, chicks, rats, and mice). The life cycle and larval stages of Z. lunata have been investigated mainly in the United States, where species of the genus Helisoma Swainson, 1840 act as first intermediate hosts (Huffman et al, 1991;Etges, 1992;Shostak et al, 1993;Nollen, 1994;Reddy and Fried, 1997;Fried et al, 2009). Among these, only Willey (1941) described in detail the morphology of the larval stages in Helisoma antrosum (Conrad).…”

Section: Introductionmentioning

confidence: 99%

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The life cycle of Zygocotyle lunata (Trematoda, Paramphistomoidea) in the subtropical region of South America

Núñez¹,

Davies²,

Spatz³

2011

Rev.Mex.Biodiv.

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The life cycle of the trematode Zygocotyle lunata (Diesing, 1836) is studied, beginning with cercariae from naturally infected Biomphalaria peregrina (d'Orbigny, 1835) and B. tenagophila (d'Orbigny, 1835) from Buenos Aires Province and Salta Province (Argentina), respectively. Adults were recovered from Gallus domesticus (Linnaeus, 1758) and Mus musculus (Linnaeus, 1758). Egg development lasted for 15-23 days at 23-24 C, and 10-12 days at 28-30 C; it was delayed after successive passages through mice, and ceased thereafter. In the snail, sporocysts, located beneath the mantle border, occurred up to 37 days post exposure (PE). Rediae invaded the entire snail body; developing cercarial bodies within rediae were recognized by the presence of a short tail, excretory canals, and eye-spot pigment. Cercariae emerged from snails as early as 20-26 days PE, encysting immediately on any substrate. These can be easily differentiated from those of Paramphistomum Fischoeder, 1901 spp. and Cotylophoron Stiles and Goldberger, 1910 spp., which have lateral excretory tubes forming a ring at the midlevel of the body and usually lack pharyngeal appendages. Metacercariae were infective for at least 6 months. Mature adults were observed 27-32 days PE in mice and 35 days PE in chicks. Biomphalaria tenagophila represents a new intermediate natural host record and Salta Province a new geographic area; Dendrocygna viduata (Linnaeus, 1766) and D. bicolor (Vieillot, 1816) from Venezuela are new host records for Z. lunata.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The life cycle of Zygocotyle lunata (Trematoda, Paramphistomoidea) in the subtropical region of South America

Núñez¹,

Davies²,

Spatz³

2011

Rev.Mex.Biodiv.

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“…The biology of this digenean has been reviewed (Fried et al, 2009). Their work established the suitability of this host for Z. lunata studies in mice.…”

Section: Introductionmentioning

confidence: 99%

Longevity of Zygocotyle lunata in Balb/c mice and long-term survival of digeneans in vertebrate hosts

Fried

LeSage

2011

J. Helminthol.

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This study used Balb/c mice to examine the longevity of Zygocotyle lunata in a murine host. Of 11 mice, each exposed to 20 Z. lunata cysts, six were infected with a total of 12 worms from 11 to 24 weeks postinfection (PI). Live worms recovered at 24 weeks PI had a mean body area of about 25 mm2. These worms produced viable eggs with well-developed miracidia following embryonation in artificial spring water for 2 weeks at 28°C. The Balb/c mouse is a useful model to study longevity of this paramphistomid trematode for at least 6 months PI. An additional aspect of this article is a review of the pertinent literature published from 1937 to 2007 on ageing and longevity of digeneans.

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“…ln nature the metacercarial cysts are often consumed inadvertently by avian and mamrnalian hosts. Such hosts become infected when the metacercarial cysts excyst within the digestive tract and later migrate to the caecum or colon where this digenean resides (Fried et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…This parasite has an almost global distribution and is present in both tropical and temperate zones. Numerous mammalian and avian species serve as natural definitive hosts of Z. lunata, as discussed in Fried et al (2009). Although no reports of human infections are available, this parasite serves as a potential zoonotic in both tropical and temperate zones.…”

Section: Introductionmentioning

confidence: 99%

Encystment and excystment of the paramphistomid trematode Zygocotyle lunata

LeSage

Fried

2010

J. Helminthol.

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This study reports further observations on encystment and excystment of the paramphistomid trematode Zygocotyle lunata. Of numerous substrates tested in the laboratory for cercarial encystment, i.e. plastic and glass dishes, Styrofoam™, aluminium foil, snail shells, and cheesecloth, all but cheesecloth allowed for 100% encystment within 4 h of cercarial release at 28°C. Numerous physical and chemical factors were tested to kill cysts, and their capacity to do so was determined by the subsequent inability of cysts to excyst within a chemical excystment medium. Vinegar, Italian salad dressing, soy sauce and 10% solutions of sucrose, acetic acid and sodium chloride were the most detrimental. Freezing, boiling and storage of cysts for more than 2 years also killed them. Several marinades such as lemon juice, Worcestershire sauce, and various concentrations of potassium permanganate, did not kill the majority of cysts tested. Since Z. lunata is a potential foodborne trematode for humans and animals, it is important to determine suitable ways to control or kill these cysts.

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Chapter 1 The Biology of the Caecal Trematode Zygocotyle lunata

Cited by 15 publications

References 61 publications

The life cycle of Zygocotyle lunata (Trematoda, Paramphistomoidea) in the subtropical region of South America

The life cycle of Zygocotyle lunata (Trematoda, Paramphistomoidea) in the subtropical region of South America

Longevity of Zygocotyle lunata in Balb/c mice and long-term survival of digeneans in vertebrate hosts

Encystment and excystment of the paramphistomid trematode Zygocotyle lunata

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