Some pathogenic microorganisms when propagated in a culture medium give distinctive colors to their colonies. Such pigmentation comes in a variety of hues and often provides important diagnostic...
Category: Bacteriology
Gram-Negative Cocci and Coccobacilli of Medical Significance
The most common gram-negative cocci of medical importance belong to the family Neisseriaceae which includes the genera Neisseria, Moraxella, Kingella, Acinetobacter, etc. Gram...
Treponema pallidum Hemagglutination Assay (TPHA) is a treponemal test for the serologic diagnosis of syphilis, a sexually transmitted infection caused by spirochetes, Treponema pallidum. Based on the...
Oxidative fermentative (OF) test: Principle, Procedure, Results
Hugh and Leifson developed the oxidative-fermentative (OF) test in 1953. They developed OF media to differentiate between oxidative bacteria (that produces acid from carbohydrates under aerobic...
Impetigo Streptococcus pyogenes is the leading cause of uncomplicated bacterial pharyngitis and tonsillitis commonly referred to as strep throat. Acute...
[caption id="attachment_3045" align="alignright" width="300"] Helicobacter pylori[/caption] Helicobacter pylori (H.pylori) is a gram-negative, curved, or spiral-shaped bacteria. It is the major cause...