Is Acinetobacter baumannii gram positive?

Is Acinetobacter baumannii gram positive?

Acinetobacter baumannii is a pleomorphic aerobic gram-negative bacillus (similar in appearance to Haemophilus influenzae on Gram stain) commonly isolated from the hospital environment and hospitalized patients. A baumannii is a water organism and preferentially colonizes aquatic environments.

Is Acinetobacter baumannii Gram positive or negative?

Acinetobacter baumannii is a Gram-negative bacillus that is aerobic, pleomorphic and non-motile. An opportunistic pathogen, A. baumannii has a high incidence among immunocompromised individuals, particularly those who have experienced a prolonged (> 90 d) hospital stay.

Is Acinetobacter a Gram-negative cocci?

Acinetobacter is a bacterial genus whose members are typically Gram-negative coccobacilli, although variable Gram-staining may be evident in pure culture due to difficulties in de-staining of crystal violet.

How many species of Acinetobacter are there?

Acinetobacter species are gram-negative, non-fermenting, often coccobacillary bacteria that belong in the family Moraxellaceae. The genus currently comprises of 34 species, 25 of them have valid names and 9 are named by their genomic group, of which A. baumannii is the most important in human infections.

Is Acinetobacter catalase positive or negative?

The genus Acinetobacter includes non-lactose-fermenting, catalase-positive, non-motile, non-fastidious, oxidase-negative, and aerobic Gram-negative coccobacilli.

Why Acinetobacter called Acinetobacter Iraqi?

It is named after the bacteriologist Paul Baumann. It can be an opportunistic pathogen in humans, affecting people with compromised immune systems, and is becoming increasingly important as a hospital-derived (nosocomial) infection.

Is Acinetobacter baumannii indole positive?

Acinetobacter baumannii was confirmed by various phenotypic tests that included: Gram-negative coccobacilli, catalase positive, oxidase negative, non-fastidious, non-fermentative (oxidative), gas negative, H2S negative, hemolysis negative, growth at 44°C, nitrate reduction negative, urease negative, indole negative.

What does Gram stain tell you?

A Gram stain is a laboratory procedure used to detect the presence of bacteria and sometimes fungi in a sample taken from the site of a suspected infection. It gives relatively quick results as to whether bacteria or fungi are present and, if so, the general type(s).

What does Gram stain tell us?

Gram staining is used to determine gram status to classify bacteria broadly. It is based on the composition of their cell wall. Gram staining uses crystal violet to stain cell walls, iodine as a mordant, and a fuchsin or safranin counterstain to mark all bacteria.

What does Gram stain stand for?

Gram stain (grăm) also Gram’s stain (grămz) n. A staining technique used to classify bacteria in which a bacterial specimen is first stained with crystal violet, then treated with an iodine solution, decolorized with alcohol, and counterstained with safranin .

Is Acinetobacter Gram positive or negative?

Acinetobacter baumannii is a pleomorphic aerobic gram-negative bacillus (similar in appearance to Haemophilus influenzae on Gram stain) commonly isolated from the hospital environment and hospitalized patients.