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Introduction Small Colony Variants (SCVs) are a subpopulation of bacteria that grow slowly and form unusually small colonies on culture media. They are most commonly described in Staphylococcus aureus, but also occur in Pseudomonas aeruginosa, Escherichia coli, and Listeria monocytogenes. SCVs are associated with chronic, …
Introduction Morphology Prototheca exhibits a unique morphology in cultural media. It forms smooth, creamy colonies on SDA. Moreover, its colonies remain non-filamentous. It produces spherical or oval cells in microscopic preparations. Furthermore, cells display a thick, refractile wall. In addition, internal endospores are occasionally arranged …
Introduction Gram staining is a routine diagnostic tool for respiratory infections. It reveals bacteria in sputum samples. Occasionally, Gram staining shows numerous pus cells but no microbes. This finding raises several clinical questions and concerns. Pus cells indicate an inflammatory response. They suggest a possible …