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Gram Negative Diplococci

Gram negative diplococci extracellular and intracellular in neutrophils. If the smear was taken from urethral discharge, it strongly suggestive of Neisseria gonorrhoeae.

Robertson’s Cooked Meat Medium

The Medium provides a favorable environment for the growth of anaerobes since the muscle protein in the heart tissue granules is a source of amino acids and other nutrients. The muscle ...

Terminal bulging spores of Clostridium tetani

Clostridium tetani is a Gram-positive, sporeforming, rod-shaped bacterium that is resistant to temperature modifications, moisture, and chemical disinfectants. C. tetani is strictly ...

Triple Sugar Iron Agar

Triple Sugar Iron medium is a differential medium that can distinguish between a number of Gram-negative enteric bacteria based on their physiological ability (or lack thereof) to: a. ...

Coagulase Test

Staphylococcus aureus is known to produce coagulase, which can clot plama into gel in tube or agglutinate cocci in slide. This test is useful in differentiating S.aureus from other ...

Catalase Test

The catalase test is used to differentiate staphylococci (catalase-positive) from streptococci (catalase-negative). The enzyme, catalase, is produced by bacteria that respire using ...

Citrate utilization Test

Simmons citrate agar tests the ability of organisms to utilize citrate as a carbon source. Simmons citrate agar contains sodium citrate as the sole source of carbon, ammonium dihydrogen ...

Urease Test

Urease test principle Many organisms especially those that infect the urinary tract, have a urease enzyme which is able to split urea in the presence of water to release ammonia and ...

Swarming growth on Blood Agar

Swarming or spreading in wave form is seen with motile organisms particularly Proteus mirabilis. Cause of swarming – The flagella of bacteria are naturally set to spin counter-clockwise ...

Microscopic Morphologic Features of the Yeast Forms of Various Dimorphic Fungi

The yeast form of Blastomyces dermatitidis is a large, 10-15 µm in diameter, thick-walled yeast cell that characteristically produces a single bud attached by a broad base. Coccidioides ...

Blue Diaper syndrome

Blue diaper syndrome is a rare, autosomal recessive metabolic disorder characterized in infants by bluish urine-stained diapers. It is caused by a defect in tryptophan absorption. ...

Microscopic Morphologic Features of the Mold Forms of Various Dimorphic Fungi

The spiked (echinulate) macroconidia seen in Image below is characteristic of the mold form of Histoplasma capsulatum. The mold form of Coccidioides immitis (Image below) is characterized ...
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