JPC SYSTEMIC PATHOLOGY

INTEGUMENTARY SYSTEM

November 2016

I-P12 (NP)

 

Signalment (JPC #1747982):  Chicken

HISTORY:  Severe scaly, crusty lesions over the unfeathered portions of the legs

Histopathologic Description:  Skin, stratum corneum:  Diffusely there is abundant orthokeratotic hyperkeratosis.  Multifocally, within the keratin, there are oval to elongate, 35 to 100um diameter clear spaces (mite tunnels) which frequently contain sections of arthropods that are oval to elongate, range from 125 to 250um in diameter, have an eosinophilic spiny chitinous exoskeleton, a hemocoel, striated muscle, and focal accumulations of deeply basophilic, 2um nuclei.  Within the mite tunnels there are scattered accumulations of brown, granular and globular material (mite feces).  There are frequent intracorneal abscesses composed of degenerate heterophils, eosinophilic cellular and karyorrhectic debris (necrosis), and occasional colonies of cocci and bacilli.

MORPHOLOGIC DIAGNOSIS:  Skin, stratum corneum:  Hyperkeratosis, orthokeratotic, diffuse, severe, with intracorneal mites and abscesses, chicken, avian. 

ETIOLOGIC DIAGNOSIS:  Cutaneous knemidokoptosis

CAUSE:  Knemidokoptes (or Cnemidocoptes) mutans

GENERAL DISCUSSION

LIFE CYCLE:

PATHOGENESIS:

TYPICAL CLINICAL FINDINGS: 

TYPICAL GROSS FINDINGS:

 TYPICAL LIGHT MICROSCOPIC FINDINGS:

 ADDITIONAL DIAGNOSTIC TESTS:

 DIFFERENTIAL DIAGNOSIS:

Gross:

Microscopic:

COMPARATIVE PATHOLOGY:

 REFERENCES:

  1. Altman RB, Clubb SL, Dorrestein GM, Quesenberry K. Avian Medicine and Surgery. Philadelphia, PA: W. B. Saunders; 1996: 341, 347, 549, 571, 884. 
  2. Bowman DD. Georgis’ Parasitology for Veterinarians. 6th ed.  Philadelphia, PA: W.B. Saunders; 1995: 66-67.
  3. Fitz-Coy SH. Parasitic diseases. In: Boulianne M., ed. Avian Disease Manual. 7th Jacksonville, FL: OmniPress; 2013:154.
  4. Gaudioso JM, LaPointe DA, Hart PJ. Knemidokoptic mange in Hawai’i’ Amakihi (Hemignathus virens) on the island of Hawai’i. J Wildl Dis. 2009;45(2): 497-501.
  5. Mainka SA, Melville DS, Galsworthy A, Black SR. Knemidocoptes on wild passerines at the Mai Po nature reserve, Hong Kong. J Wildl Di. 1994; 30(2):254-6.
  6. Hinkle NC, Corrigan RM. External parasites and poultry pests. In: Swayne DE, Glisson JR, McDougald LR, Nolan LK, Suarez DL, Nair V., eds. Diseases of Poultry. 13th ed.  Ames, Iowa: Wiley Blackwell; 2013:1101-2.  
  7. Pence DB, Cole RA, Brugger KE, Fischer JR. Epizootic podoknemodokoptiasis in American robins. J Wildl Dis. 1999;35(1):1-7.
  8. Randall CJ, Reece RL. Color Atlas of Avian Histopathology. London, England: Mosby-Wolfe; 1997: 46.


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