Mycology.txt

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Author:
kackerson
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55537
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Mycology.txt
Updated:
2010-12-13 02:25:10
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Mycology
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BacT-Mycology
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  1. T/F Mycology is about virulence, not numbers.
    F- It's about numbers! Not VIRULENCE
  2. What are the only prokaryotes that cause dz. in humans and animals?
    Bacteria
  3. What are the two forms of fungus?
    Mold and yeast
  4. What type of fungus is both saprophytic and yeast-like (pathogenic)?
    Dimorphic fungi
  5. What is the cell membrane made out of in fungi?
    Sterols (ergosterol)
  6. Do bacteria have sterols like fungi?
    No
  7. What is the difference between reproduction in fungi and bacteria?
    Fungi are either sexual or asexual while bacteria use binary fission
  8. T/F The cell wall of fungi causes disease?
    F
  9. Where do pseudohyphae originate from?
    The cell
  10. At what temperature does dimorphic fungi reproduce in tissues? What form?
    At 35 degrees celsius, yeast form
  11. Do fungi go through sexual or asexual reproduction more frequently?
    Asexual
  12. T/F Fungi do not produce endotoxins or exotoxins?
    TRUE
  13. What enzyme is secreted my Dermatophytes?
    Keratinase
  14. Define superficial mycoses:
    limited to superficial layers of the skin and along the hair shafts. NONDESTRUCTIVE! Only of cosmetic importance
  15. Define Cutaneous mycoses:
    Restricted to the keratinized layers of the skin and its appendages. May become symptomatic
  16. Define Subcutaneous Mycoses:
    Fungal infections involving the dermis, SQ, muscle, fascia and sometimes bone.
  17. Define systemic mycoses:
    Deep within the body. Usually caused by dimorphic fungi
  18. Define opportunistic mycoses:
    Low virulence and usually affect the immunocompromised
  19. Which media is best for fungal growth and isolation?
    Sabouraud's dextrose agar (SDA)
  20. What are the three species related to Dermatophytes? Which two are of most clinical relevance?
    Epidermophyton, Microsporum, and Trichophyton (M and T most important)
  21. Are dermatophytes contagious?
    Yes
  22. What is the common name referred to dermatophytes?
    Ringworm
  23. Define Geophilic:
    dermatophytes found in soil and occasional pathogens of humans and animals
  24. Define Zoophilic:
    Parasites of the hair and skin of animals but can be transmitted to humans
  25. Define Anthropophilic:
    Parasites of human skin that can be transmitted from human to human
  26. T/F Infected skin or hair can be infective for up to 9 months?
    FALSE: 12 MONTHS!
  27. Ring lesions appear because of what healing process?
    Central healing with peripheral inflammation.
  28. What is the best location to take a skin sample?
    Peripheral to the lesion where a fungus may move to during a healing process.
  29. What type of HS response might you see from Dermatophyte proteins?
    Type I
  30. What color is a positive DTM for dermatophytes?
    Red (Phenol red is the ph indicator, therefore negative would be yellow in color)
  31. Sporothrix schenckii is what level of mycoses?
    Subcutaneous and dimorphic
  32. The main host of S. schemckii:
    Horses, humans, dogs and cats
  33. Decribe the pathogenesis of S. schemckii:
    yellow pus with cordlike and thickened vessels. Ulcers are cutaneous nodules that develop along the superficial lymphatics
  34. Is S. schemckii ascending or descending?
    Ascending
  35. Under direct examination, S schemckii take on what shape?
    Cigar shaped yeast cell
  36. Where may S. Schmeckii be found (cell type)?
    Neutrophils
  37. Common name for cutaneous pythiosis:
    Mycotic Swamp Cancer, Florida HOrse Leeches
  38. EA for pythiosis:
    Pythium insidiosum
  39. Mycotic swap fever is most common in:
    Subtropical and tropical regions. Infiltrates damaged tissue wading through stagnant, swamp water
  40. T/F pythiosis can infiltrate the blood stream and disseminate?
    T
  41. What are the skin lesions like in pythiosis?
    pyogranulomatous
  42. Canine pythiosis mostly involves:
    The stomach and SI with signs of cutaneous lesions
  43. Is pythiosis self-limiting?
    No. Surgery is necessary
  44. The pathogenic yeast candida albicans infects mostly by:
    endogenous origin
  45. Cadididiasis is also known as:
    monilliasis, Thrush, candidosis
  46. What are some predisposing factors to candidiasis?
    • Immunnosupression
    • Prolonged use of broad spectrum antibiotics
    • mucosal damage
    • intercurrent infections
  47. Pathogenesis of thrush:
    ulcerative inflammation of the mucous membranes, esophagus, crop etc.
  48. What pathognomonic lesion would you see in candidiasis of chickens, turkeys and pigeons?
    the terry toweling effect of yellowish grey necrotic tissue in the crop and esophagus
  49. What is the only yeast that has a capsule?
    Cryptococcosis (Torulosis)
  50. Another name for cryptococcosus:
    Torulosis
  51. What is a common finding in cats infected with cryptococcosis?
    Blindness
  52. Cryptococcosis can disseminate where?
    To the CNS-then to the optic nerve causing blindness
  53. What stain highlights the thick capsule of cryptococcosis?
    Indian ink
  54. How long can pigeons carry cryptococcosis without developing signs?
    1 year
  55. What is found in pigeon feces that cryptococcosis utilizes?
    Creatinine
  56. What specimens can be used to diagnose cryptococcus?
    Milk, blood, CSF, exudates, and tissues
  57. Which yeast cells are shaped like a bottle?
    Malassezia pachydermatis
  58. M pachydermatis is attracted to what type of tissues?
    oily areas of skin because they are lipophylic
  59. Cigar shaped yeast cells?
    Sporothrix shenckii
  60. What percentage of aspergillosis is caused by A. fumigates?
    90-95%
  61. What is the pathogenesis seen with Aspergillosis?
    yellowish-grey nodules on respiratory tissue
  62. EA for Brooder pneumonia:
    Aspergillus fumigatus
  63. Which stage of aspergillosis has CNS involvement?
    Acute
  64. What species of dimorphic fungi do we have?
    • Blastomyces dermatidis
    • Coccidiodes immitis
    • Histoplasma capsulatum
  65. Blastomyces dermatidis-
    affects humans and dogs, not contagious, thick double cell wall, can be fatal
  66. Coccidiodes immitis-
    San Jaochim Valley Fever, affects dogs, horses and humans, barrel-shaped, can be fatal, mature endospores are only found in tissue
  67. Histoplasma capsulatum-
    found in bat and bird feces and the yeast cells grow in monocytes and macrophages, impaired cell mediated immunity in cats and dogs, more prevalent in eastern US
  68. Mycotic abortion EA's:
    • Aspergillus spp.
    • Candida spp.
    • Mucor spp.
  69. Mycotic mastitis EA's:
    • *Cryptococcus spp.
    • *Candida spp.
    • Aspergillus spp.
  70. T/F mycotic mastitis infections move from quarter to quarter?
    F
  71. Guttural Pouch Mycoses EA's
    Aspergillus but think Bacterial first (Strep equi)
  72. Mycotic Keratitis EA's:
    Blastomyces or Cryptococcus (Systemis dissemination)
  73. What is the most potent natural carcinogen?
    B1 aflatoxin
  74. In ergotism, what is ingested to result in the pathogenic lesions?
    Sclerotia
  75. Which species is most susceptible to agalactia in ergots?
    Swine
  76. What are the three requirements for photosensitization?
    • Hepato-toxic plant
    • phylloerythrin (photosensitizing pigment) from plants
    • UV exposure
  77. What is the pathogenesis of photosensitization?
    Chollangitis and pericholangitis leading to biliary obstruction
  78. What is the etiologic agent for estrogenism? What species is most susceptible?
    Fusarium graminearum, Swine

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