Question

1.         The mold forms of certain dimorphic pathogens must be differentiated from morphologically similar environmental saprophytes, using either yeast conversion, antigen extraction assays or nucleic acid probes. These "look-alike" pairs include:

            1.         Blastomyces and Chrysosporium

            2.         Coccidioides and Paracoccidioides

            3.         Histoplasma and Sepedonium

            4.         Trichosporon and Sporothrix

2.       A yeast isolate may be considered to be normal flora when recovered from each of the following clinical specimens except:

1. sputum
2. stool
3. blood
4. vaginal secretion

3.         The Dermatophyte(s) most commonly associated with hair infections belongs to the genus (genera):

            1.         Epidermophyton

            2.         Microsporum

            3.         Trichosporon

            4.         Trichophyton

4.         Trichophyton tonsurans requires which of the following supplements in Trichophyton agar for the growth:           

            1.         Inositol

            2.         Thiamine

            3.         Casein

            4.         Urea

5.         The feature by which Paracoccidioides brasiliensis, the cause of South American blastomycosis, can be recognized is (are):

1.         large, round, thick walled cells with multiple buds

            2.         multiple buds that sprout from a single mother cell in tissue

            3.         mold with chlamydospores at room temperature

            4.         single conidia at 25^o C resembling “lollipops”

                

please can you answer these multiple choice questions.

Answer 1

1. The look-alike pairs include Coccidioides and Paracoccidioides as Coccidioides can change into the dimorphic fungus paracoccidioides.,

2. A yeast isolate may be considered to be normal flora when recovered from each of the following clinical specimens except the blood unless and untill the yeast is invasive and attack the endothelial cells.

3.The Dermatophyte(s) most commonly associated with hair infections belongs to the genus (genera):Tricophyton.

4.  Trichophyton tonsurans requires which of the following supplements in Trichophyton agar for the growth is inositol.

5.  The feature by which Paracoccidioides brasiliensis, the cause of South American blastomycosis, can be recognized is large, round, thick walled cells with multiple buds