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Worksheetspythium quiz
Total questions: 10
Worksheet time: 5mins
Pythium belongs to which class of organisms ?
Phylum Straminipila, Class Oomycetes, Order Pythiales, and Family Pythiaceae
class Straminipila, phylum Oomycetes, Order Pythiales, and Family Pythiaceae
class Straminipila, phylum Oomycetes, family Pythiales, and order Pythiaceae
order Straminipila, Class Oomycetes, Order Pythiales, and phylum Pythiaceae
The various presentations of pythium keratitis are ?
Ocular
Vascular
Cutaneous
all of the above
Phythium keratitis has been found to be associated with
thalassemia/hemoglobinopathy syndrome
cavernous sinus thrombophlebitis.
paroxysmal nocturnal haemoglobinuria
all of the above
The increased incidence of Pythium keratitis in thalassemia patients is due to ?
Iron overload
Hemochromatosis
Inhibition of phagocytic action of TNF-a, IFN-c, macrophages, and neutrophil production
All of the above
The difference in gram staining and 10 % KOH mount between Pythium keratitis and fungus are ?
Slender long septate or aseptate hyaline hyphae
Perpendicular lateral branches along the hyphae
Presence of numerous vesicles in hyphae of Pythium
All of the above
Which color change is used for identifying hyphae of Pythium keratitis in staining by iodine potassium iodide (IKI) and sulfuric acid stain (IKI-H2SO4).
Blue to bluish black
Yellow to yellowish brown
Red to brown
Green to bluish
Why do Pythium keratitis stain different from Fungus in PAS stain ?
The presence of cholesterol in the Pythium cell wall, which gives a weaker acid reaction with pectin and chitin.
The presence of cellulose in the Pythium cell wall, which gives a weaker acid reaction with pectin and chitin.
The presence of ergosterol in the Pythium cell wall, which gives a weaker acid reaction with pectin and chitin.
all of the above
The classical clinical features which separate Pythium from other infective keratitis are ?
stromal infiltrate with hyphenated edges
tentacular projections
peripheral furrowing with thinning, and guttering
All of the above
Which features mimic atypical Mycobacteria in Pythium keratitis ?
Epithelial breach and greyish white stromal infiltrate
cracked windshield appearance of the infiltrates
Stromal edema and Descemet membrane folds
All of the above
The following features are characteristic in invivo confocal microscopy of Pythium keratitis ?
Beaded branching hyperreflective structures
long slender, thin hyperreflective lines
The branching angle of Pythium hyphae is around 78.6 degrees
All of the above
