Is Neisseria sicca citrate positive or negative?

Neisseria sicca is a gram-negative diplococcus found as nor- mal human oral and upper respiratory tract flora; it is considered one of the commensal Neisseria species.

Is Neisseria sicca acid fast positive or negative?

Bacterial Characteristics. Neisseria spp. are a Gram-negative non-spore-forming diplococcus that has a flattened shape; its size ranges between 0.6–0.8 μm. They are oxidase-positive, non-acid-fast cocci or plump rods.

Is Neisseria sicca catalase positive?

Although N. mucosa may be differentiated from the N. sicca, N. subflava biovar perflava by a nitrate reduction test, there are no biochemical methods for differentiating between these latter species….Neisseria sicca.

Characteristic Illustration
Catalase Test Catalase-positive
Colistin Resistance

Is Neisseria gonorrhoeae catalase positive or negative?

N. gonorrhoeae is oxidase positive (possessing cytochrome c oxidase) and catalase positive (able to convert hydrogen peroxide to oxygen). When incubated with the carbohydrates lactose, maltose, sucrose, and glucose, N. gonorrhoeae will oxidize only the glucose.

Does Neisseria sicca ferment lactose?

Neisseria sicca They also utilize glucose, maltose, fructose and sucrose to produce acid and not lactose and mannose. They are oxidase and catalase positive and also reduce nitrites but not nitrates4.

Is Neisseria a sicca oxidase test?

Neisseria sicca is a commensal organism belonging to the genus Neisseria. It is Gram-negative and oxidase-positive. There are multiple strains of this species, some of which are reported to have caused septicaemia in immunocompromised patients.

Is Neisseria catalase negative?

Neisseria spp. are oxidase positive and catalase positive, except N. elongata, which is catalase negative. All species produce acid from a few carbohydrates by oxidation.

What is the presumptive test for Neisseria?

Presumptive identification of N gonorrhoeae: The Gram stain of a smear of urethral exudates or endocervical secretions shows typical Gram-negative intracellular diplococci.

What does Neisseria sicca cause?

Neisseria sicca: A Rare Cause of Bacterial Conjunctivitis – PMC.

Is Neisseria meningitidis gram-negative?

Chapter 7: Identification and Characterization of Neisseria meningitidis. N. meningitidis are gram-negative, coffee-bean shaped diplococci that may occur intracellularly or extracellularly in PMN leukocytes.

Is meningococcal Gram positive or negative?

Acute bacterial meningitis can be caused by different Gram-negative bacteria including meningococcal and H influenzae. This article covers Gram-negative meningitis caused by the following bacteria: Escherichia coli.