Mycology: Yeasts and Dimorphic Pathogens (Online CE Course)

(based on 441 customer ratings)

Author: Elmer W. Koneman, MD
Reviewer: Margaret Reinhart MS, MT(ASCP)

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Mycology: Yeasts and Dimorphic Pathogens uses an interrogative, question-and-answer, approach to direct and instruct the participant in identifying yeasts and dimorphic fungi. Numerous images enhance the descriptions of identifying characteristics by illustrating the appearance of fungal colonies on media and microscopic appearance. The course also identifies sources of infection and associated diseases. This course is appropriate for laboratory professionals and students in clinical laboratory science programs who want to increase their understanding of mycology including microscopic and colony appearance and isolate identification.

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Continuing Education Credits

P.A.C.E.® Contact Hours (acceptable for AMT, ASCP, and state recertification): 2 hour(s)
Approved through 7/31/2022
Florida Board of Clinical Laboratory Personnel Credit Hours - General (Microbiology/Mycology/Parasitology): 2 hour(s)
Approved through 9/1/2022

Objectives

  • Define terms that are used to describe morphologic features of molds.
  • Describe preliminary identification methods for various yeasts.
  • Identify yeast species by observing the appearance of the colony morphology and through microscopic appearance.
  • Interpret various yeast patterns of growth on cornmeal agar.
  • Discuss various diseases that are associated with yeasts.
  • Define "dimorphic fungi" and identify dimorphic pathogens.
  • Describe microscopic and colony morphologies that aid in the identification of dimorphic pathogens.
  • Identify sources and diseases that are associated with dimorphic pathogens.
  • Recognize saprophytic molds that can mimic morphologic features of dimorphic pathogens and describe methods to inhibit the growth of these saprophytic counterparts.

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Course Outline

Click on the links below to preview selected pages from this course.
  • General Information Related to Identification of Molds
  • Morphologic Features of Yeast
      • Preliminary Identification Methods for Various Yeasts
      • Morphologic Features of Yeast Colonies
      • Microscopic Morphologic Features of Yeast
      • Malassezia
      • Which of the organisms listed below has the unique property of producing germ tubes when fetal bovine serum is lightly inoculated with the yeast isola...
      • The growth of the yeast-like colonies shown in the upper image was obtained on blood agar from a skin culture only in the area overlaid by virgin oliv...
  • Yeast Identification Using Cornmeal Agar
      • Interpretation of Growth Patterns on Cornmeal Agar
      • Examples of Cornmeal Agar Morphologies
      • Match each of the cornmeal agar morphologies listed in the drop-down box with the name of its corresponding yeast species on the right.
      • Match each of the fungal species listed below with the appropriate category, indicating whether or not it has the capability of producing pseudohyphae...
      • A yeast identification system gave a biotype number for an unknown isolate that did not differentiate between Candida tropicalis and Candida parapsilo...
  • Extending the Preliminary Identification to Full Identification
      • Evaluating the Need for Full Identification of Yeast
      • Recommended Procedure for Identification of Cryptococcus neoformans
      • Arrange in sequence the steps that should be taken to make a definitive identification of Cryptococcus neoformans.
      • The colonies illustrated in this photograph were recovered from a blood culture after 48 hour incubation at 30°C. What is the MOST likely source ...
      • Illustrated in this photomicrograph of a lactophenol blue preparation of a urine sediment is a cluster of yeast cells that were presumptively identifi...
  • Dimorphic Pathogens
      • What are Dimorphic Fungi
      • Microscopic Morphologic Features of the Mold Forms of Various Dimorphic Fungi
      • Microscopic Morphologic Features of the Yeast Forms of Various Dimorphic Fungi
      • Culture Confirmation Methods
      • Histoplasma capsulatum
      • Coccidioides immitis
      • Sporothrix schenckii
      • Blastomyces dermatitidis
      • Paracoccidioides brasiliensis
      • Match each of the names of the dimorphic fungi listed with the names of the animals that most commonly may be related to transmission of disease to hu...
      • The colonies shown in the upper image were obtained on blood agar from a sputum specimen after 10 days incubation at 30°C. The lower image is a l...
      • The growth of the colonies shown in the upper image was obtained on blood agar from a sputum specimen after incubation at 30°C. The lower image i...
      • The colonies shown in the upper image, obtained from a biopsy of an ulcerating skin lesion of the arm, are growing on agar slants of Sabouraud's dextr...
      • The upper image illustrates a subculture of a mold colony suspected of being a dimorphic fungus inoculated to the surface of blood agar and incubated ...
      • Although care should be taken when working with all fungus cultures in the laboratory, personnel are particularly prone to develop laboratory acquired...
      • Which dimorphic fungus may produce black, yeast-like colonies after prolonged incubation at 37°C?
      • Match each of the names of the dimorphic fungal species from the drop-down box with its mold form shown below.
      • The images below are lactophenol blue mounts of the yeast forms of various dimorphic fungi. Which of the images is consistent with an identification o...
  • Differentiating Dimorphic Molds from Saprophytic Counterparts
      • Differentiating Dimorphic Fungi from Saprophytic Molds
      • Inhibiting the Growth of Saprophytic Molds
      • This image illustrates a lactophenol blue mount of a mold recovered after 7 days incubation of brain heart infusion broth. The large macroconidia sugg...
      • Which of the following ingredients is added to culture media to enhance the recovery of the dimorphic fungi by preventing the overgrowth of more rapid...
  • References

Additional Information

Level of instruction: Intermediate
 
Target audience: Microbiologists, medical laboratory scientists, medical laboratory technicians, and MLS students.
Author information: Elmer W. Koneman, MD, received his graduate degree from the University of Colorado School of Medicine at Denver, Colorado and is currently Professor Emeritus at their Department of Pathology. He is the author of numerous journal articles and books, including Color Atlas and Textbook of Diagnostic Microbiology, Fifth Edition, 1997(Lippincott) and is presently affiliated with Instructional Design Consultants, a consulting firm specializing in interactive training and distance learning for clinical microbiology.
 
Reviewer information: Margaret Reinhart MS, MT(ASCP) is the MLS Program Director and Senior lecturer in Biological Sciences at the University of the Sciences in Philadelphia PA where she teaches hematology, clinical immunology, parasitology and other related courses. She is also adjunct instructor in Hematology at Pennsylvania Hospital, Philadelphia PA. She holds a Masters Degree in Biology and in Health Care Administration.
 
Content information: This course describes and identifies medically important yeast and dimorphic pathogens. Many photomicrographs are used to assist with recognition of organisms in culture and microscopically.

Keywords

These are the most common topics and keywords covered in Mycology: Yeasts and Dimorphic Pathogens:

organisms parapsilosis mycelium photomicrograph candida sputum lollipop spherules red-brown assimilation morphologic saccharomyces budding carcasses fungemia morphologies cells ascospores thick-walled pigmentation glucose conidiophore infections cornmeal coccidioides torulopsis diagnosis protein wrinkled intravenous saprophytes stick cerevisiae membranes blastomycosis eukaryotes laurentii non-pigmented nucleic glabrous shunt petals blastospores mucoid appears gray-white subculture desert capsules pseudotropicalis mucous sporothrix brain logs septation rodents dextrose malassezia cycloheximide alveolar immunocompromised antifungal yellow-white necks arthroconidia rubra lactophenol specimens daisy inoculate mount serum rectangular mariners successively versicolor blastoconidia matchstick hockey biopsy polypeptide echinulate morphology river conidium inhalation prowl furfur methods endemic decaying yeast-like polysaccharide cryptococcus caves dubliniensis immitis macroconidia culture rhodotorula yeasts contracted saprophytic bird valleys dermatitidis multilateral vaginal bovine rats dimorphic filamentous urine glabrata coccidioidomycosis burrows cob-web 35#176-37#176c body olive fungi hyphae brasiliensis capsulatum buds organism neoformans flower colony fetal inoculated ulcerating microconidia pseudohyphae drop-down molds cutaneous endospores phenoloxidase cryptococci tinea heart germ aerosolization gray-green ascospore agar trichosporon schenckii ribosome alternately diagnostic laboratory fungus chlamydoconidia downy pathogen disease prickly guano fungal attachments kentucky kefyr daisy-head reproduces histoplasma histoplasmosis bats arthroconidium peritoneal caffeic albicans infection conidia sabourauds soil brown-black incubation clinical lollipops hemoglobin orange-pink dialysis catheter blood clusters hyphal geotrichum differential cottony intraventricular blastomyces materials identification broad-based paracoccidioides respiratory mississippi trehalose chlamydospores
How to Subscribe
MLS & MLT Comprehensive CE Package
Includes 146 CE courses, most popular
$95Add to cart
Pick Your Courses
Up to 8 CE hours
$50Add to cart
Individual course$20Add to cart
Need multiple seats for your university or lab? Get a quote
Candida parapsilosis, cornmeal agar mount.  Characteristic is the production of several spider-like colonies, composed of delicate pseudohyphae, produced along the margins of the streak.


dimorphic fungi yeast forms microscopic


question Blastomyces


lollipop conidia


yeast01


YEAST02


Yeast03


yeast15 big