Gram Negative Coccobacilli

Bordetella pertussis: Properties, Pathogenesis, Lab Diagnosis

Bordetella pertussis: Properties, Pathogenesis, Lab Diagnosis

Agent of whooping cough (pertussis), Bordetella pertussis is a small gram-negative coccobacilli.

Haemophilus Influenzae Virulence Factors

Haemophilus Influenzae Virulence Factors

Capsule, adhesion proteins, lipooligosaccharides, pili, IgA protease, and phase variations of H.influenzae play major roles in pathogenesis.

Acinetobacter: Disease, Properties, Resistance

Acinetobacter: Disease, Properties, Resistance

Acinetobacter are gram-negative coccobacilli, among them Acinetobacter baumannii accounts for most  infections in humans in hospital settings.

X and V factor test for Haemophilus

X and V factor test for Haemophilus

Haemophilus species require accessory growth factors such as X (hemin), V (NAD) or a combination of both.

Gram-Negative Cocci and Coccobacilli of Medical Significance

Gram-Negative Cocci and Coccobacilli of Medical Significance

Gram-negative cocci of medical importance belong to the family Neisseriaceae which includes the genera Neisseria, Moraxella, Kingella, Acinetobacter.

Brucella: Properties, Pathogenesis, Lab Diagnosis

Brucella: Properties, Pathogenesis, Lab Diagnosis

Brucellosis, also known as “Undulant fever”, “Mediterranean fever” or “Malta fever” or “Bang’s disease”  is a zoonosis caused by Brucella melitensis.

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Coxiella burnetii: Properties, Pathogenesis, Lab Diagnosis

Q fever is caused by the intracellular bacterium Coxiella burnetii and is endemic in nearly every country in the world.

Satellitism Test for Haemophilus influenzae

Satellitism Test for Haemophilus influenzae

Haemophilus spp may grow on sheep blood agar very close to the colonies of Staphylococcus aureus.

Shapes of Bacteria: Cocci, Bacilli, and Spirochetes

Shapes of Bacteria: Cocci, Bacilli, and Spirochetes

Bacteria exist in four basic morphologies: cocci; rod-shaped cells, or bacilli; spiral-shaped cells, or spirilla; and comma-shaped cells, or vibrios.