JPC SYSTEMIC PATHOLOGY

INTEGUMENTARY SYSTEM

November 2016

I-P11 (NP)

 

Signalment (JPC #1685305):  An age and breed unspecified chicken 

HISTORY:  Numerous yellowish nodules up to several millimeters in diameter were noted at slaughter.

HISTOPATHOLOGICAL DESCRIPTION:  Feathered skin:  Multifocally within the subcutis and dermis, separating dermal collagen bundles and creating many variably sized oval to elongate cavitary spaces up to 500 um in diameter, are multiple tangential and cross sections of arthropods.  The arthropods are up to 400 um in diameter and are characterized by a fragmented chitinous exoskeleton with intact spines, partially intact, jointed appendages, a hemocoel, striated muscle, multiple cross sections of gastrointestinal, and male and female reproductive tracts.  There is moderate to marked postmortem degeneration due to scalding and autolysis.

The other tissue sections on this slide are not related to Laminosioptes cysticola.

MORPHOLOGIC DIAGNOSIS:  Feathered skin, subcutis and dermis:  Cysts, multifocal, with multiple arthropod mites, chicken, avian.

ETIOLOGIC DIAGNOSIS:  Subcutaneous acariasis

CAUSE:  Laminosioptes cysticola

CONDITION:  Laminosioptiasis

CONDITION SYNONYMS:  Fowl cyst mite; subcutaneous mite

GENERAL DISCUSSION:  

PATHOGENESIS:

TYPICAL CLINICAL FINDINGS:

TYPICAL GROSS FINDINGS:

TYPICAL LIGHT MICROSCOPIC FINDINGS:

DIFFERENTIAL DIAGNOSIS:

COMPARATIVE PATHOLOGY:

OTHER SPECIES OF MITES OF IMPORTANCE TO POULTRY:

 REFERENCES:

  1. Arends JJ. External parasites and poultry pests. In: Calnek BW, Barnes HJ, Beard, CW, et. al., eds. Diseases of Poultry. 10th ed. Ames, IA: Iowa State University Press; 1997:785, 800-807.
  2. Bowman DD, Lynn RC. Arthropods. In: Bowman DD, Lynn RC, eds. Georgis’ Parasitology For Veterinarians. 6th ed. Philadelphia, PA: W. B. Saunders Company; 1995:69-70.
  3. Hendrix CM, Kwapien RP, Porch JR. Visceral and subcutaneous acariasis caused by hypopi of Hypodectes propus bulbuci in the cattle egret. J Wildlife Dis. 1987;23(4):693-697.
  4. Hinkle NC, Corrigan RM. External parasites and poultry pests. In: Swayne DE, et al, eds. Diseases of poultry. 13th ed. Ames, IA: Iowa State University Press; 2013: 1099-1116.
  5. Keymer, IF. Parasitic diseases. In: Petrak ML, ed. Diseases of Cage and Aviary Birds. 2nd ed. Philadelphia, PA: Lea & Fabriger; 1982:535, 578-593.
  6. Smith KE, Quist CF, Crum JM. Clinical illness in a wild turkey with Laminosioptes cysticola infestation of the viscera and peripheral nerves. Avian Dis. 1997;41(2):484-489.


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Click on image for diagnostic series.



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