PMC8479967_01
Direct Albert stain from the throat swab showing abundant green coloured bacilli with metachromatic granules arranged in cuneiform pattern.
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PMC8479967_01_acmi-3-0238-g001.jpg
F1
Albert stain and culture. Albert stain revealed plenty of green coloured bacilli with metachromatic granules studded along the bacilli arranged in cuneiform pattern (Fig. 1).
Dry, rough, white, nonhaemolytic colonies with irregular margins observed on the blood agar plates.
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PMC8479967_01_acmi-3-0238-g002.jpg
F2
Following overnight incubation of the culture plates, dry, rough, white, nonhaemolytic colonies with irregular margins were observed on the blood agar (Fig. 2).
Black, dry, rough, colonies with irregular margins observed on the potassium tellurite agar.
acmi-3-0238-g003.jpg
PMC8479967_01_acmi-3-0238-g003.jpg
F3
Greyish black, dry, rough, colonies with irregular margins were seen on the potassium tellurite agar, which on further incubation of up to 48 h turned to black coloured colonies (Fig. 3).