Impact of poxvirus lesions on saltwater crocodile (Crocodylus porosus) skins

Rhiannon L. Moore, Sally R. Isberg, Cathy M. Shilton, Natalie L. Milic

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    Cutaneous poxvirus infections are common in several crocodilian species and are of importance in crocodile farming due to their potential impact on the tanned hide. To confirm poxvirus infection and understand the impact on saltwater crocodile (Crocodylus porosus) skin, fourteen animals from different age groups (five hatchlings, five yearlings and four grow-outs) were selected based on a criterion of ten poxvirus-like lesions per animal. One lesion on each animal was extruded for genetic analysis and transmission electron microscopy. Both methods confirmed poxvirus so the remainder of lesions were re-examined every six weeks over a 24 week study period. Each lesion went through four distinct phases: early active, active, expulsion and healing. To understand how these lesions impact on the final skin product, one crocodile from each age group was euthanised and the lesions examined. Using standard skin grading techniques (light-table), the early phase (early active – expulsion) lesions were all translucent and would lead to downgrading of the skin or, at worst, rendering them unsaleable. At the later stages of healing, the translucency reduces. Histological examination of the phases confirm that the basement membrane is not breached by the infection further indicating that poxvirus lesions, given enough time, will eventually have no detrimental effect on skin quality. This is obviously dependent upon no more lesions developing in the interim.

    Original languageEnglish
    Pages (from-to)29-35
    Number of pages7
    JournalVeterinary Microbiology
    Volume211
    DOIs
    Publication statusPublished - Nov 2017

    Fingerprint

    Poxviridae
    Crocodylus porosus
    Alligators and Crocodiles
    skin (animal)
    lesions (animal)
    Skin
    Poxviridae Infections
    Age Groups
    crocodile farming
    Agriculture
    Transmission Electron Microscopy
    Basement Membrane
    Crocodylia
    infection
    hides and skins
    animals
    crocodiles
    basement membrane
    rendering
    Light

    Cite this

    Moore, Rhiannon L. ; Isberg, Sally R. ; Shilton, Cathy M. ; Milic, Natalie L. / Impact of poxvirus lesions on saltwater crocodile (Crocodylus porosus) skins. In: Veterinary Microbiology. 2017 ; Vol. 211. pp. 29-35.
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    abstract = "Cutaneous poxvirus infections are common in several crocodilian species and are of importance in crocodile farming due to their potential impact on the tanned hide. To confirm poxvirus infection and understand the impact on saltwater crocodile (Crocodylus porosus) skin, fourteen animals from different age groups (five hatchlings, five yearlings and four grow-outs) were selected based on a criterion of ten poxvirus-like lesions per animal. One lesion on each animal was extruded for genetic analysis and transmission electron microscopy. Both methods confirmed poxvirus so the remainder of lesions were re-examined every six weeks over a 24 week study period. Each lesion went through four distinct phases: early active, active, expulsion and healing. To understand how these lesions impact on the final skin product, one crocodile from each age group was euthanised and the lesions examined. Using standard skin grading techniques (light-table), the early phase (early active – expulsion) lesions were all translucent and would lead to downgrading of the skin or, at worst, rendering them unsaleable. At the later stages of healing, the translucency reduces. Histological examination of the phases confirm that the basement membrane is not breached by the infection further indicating that poxvirus lesions, given enough time, will eventually have no detrimental effect on skin quality. This is obviously dependent upon no more lesions developing in the interim.",
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    Impact of poxvirus lesions on saltwater crocodile (Crocodylus porosus) skins. / Moore, Rhiannon L.; Isberg, Sally R.; Shilton, Cathy M.; Milic, Natalie L.

    In: Veterinary Microbiology, Vol. 211, 11.2017, p. 29-35.

    Research output: Contribution to journalArticleResearchpeer-review

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    AU - Milic, Natalie L.

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    AB - Cutaneous poxvirus infections are common in several crocodilian species and are of importance in crocodile farming due to their potential impact on the tanned hide. To confirm poxvirus infection and understand the impact on saltwater crocodile (Crocodylus porosus) skin, fourteen animals from different age groups (five hatchlings, five yearlings and four grow-outs) were selected based on a criterion of ten poxvirus-like lesions per animal. One lesion on each animal was extruded for genetic analysis and transmission electron microscopy. Both methods confirmed poxvirus so the remainder of lesions were re-examined every six weeks over a 24 week study period. Each lesion went through four distinct phases: early active, active, expulsion and healing. To understand how these lesions impact on the final skin product, one crocodile from each age group was euthanised and the lesions examined. Using standard skin grading techniques (light-table), the early phase (early active – expulsion) lesions were all translucent and would lead to downgrading of the skin or, at worst, rendering them unsaleable. At the later stages of healing, the translucency reduces. Histological examination of the phases confirm that the basement membrane is not breached by the infection further indicating that poxvirus lesions, given enough time, will eventually have no detrimental effect on skin quality. This is obviously dependent upon no more lesions developing in the interim.

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