Phenylethyl alcohol agar (PEA) is a selective medium used to cultivate Gram-positive organisms, particularly cocci, from a sample containing a mixture of pathogens. The active ingredient, phenylethyl...
Month: May 2021
Demonstration of Treponema pallidum Using Dark-Field Microscopy
Treponema pallidum is a thin, delicate, tightly wound spirochaete that cannot be seen in Gram-stained smears. So, dark-field microscopy is used to demonstrate the presence of motile Treponema...
Critical/panic values are defined as values that are outside the normal range to a degree that may constitute an immediate health risk to the individual or require immediate action on the part of the...
Microbiology Sample Collection Guidelines and Rejection Criteria
Proper collection and transport of the biological specimens to the laboratory for culture is the most crucial step in the recovery of pathogenic organisms responsible for infectious diseases. A...
Bordetella pertussis: Properties, Pathogenesis, Lab Diagnosis
Bordetella pertussis is a small Gram-negative coccobacillus. It is the causative agent of whooping cough (pertussis), an acute respiratory infection most common in children. Two species, B....
Adaptation is the key for the survival. Organisms with successful adaption strategies are more likely to survive than others. Dinosaurs failed to adapt to the new environment and therefore became...