Alcaligenes faecalis is a Gram-negative catalase- and
oxidase-positive, motile rod
. It is commonly found in a watery environment and is rarely isolated from humans.
How do you identify Alcaligenes faecalis?
A. faecalis is a Gram-negative bacterium which appears rod-shaped and motile under a microscope. It is
positive by the oxidase test and catalase test
, but negative by the nitrate reductase test. It is alpha-hemolytic and requires oxygen.
Is Alcaligenes faecalis aerobic or anaerobic?
Alcaligenes faecalis is an
aerobic nonfermentative
, oxidase-positive, nonencapsulated, gram-negative rod (1). It is so named for its ability to produce an alkaline reaction in certain media (2). A. faecalis is the most fre- quently isolated member of family Alcaligenaceae in the clinical laboratory.
Is Alcaligenes faecalis a obligate Aerobe?
Alcaligenes faecalis is a
Gram-negative, obligate aerobe
, oxidase-positive, catalase-positive, and non-fermenting bacterium commonly found in soil, water, and hospital environments.
What is the morphology of Alcaligenes faecalis?
Alcaligenes faecalis is a
Gram-negative, rod-shaped bacterium with flagella
, and belong to the family of Alcaligenaceae. Particularly in immunosuppressed people, the opportunistic pathogen may trigger local infections, including peritonitis, meningitis, otitis media, appendicitis, and bloodstream infection.
Is E. coli aerobic or anaerobic?
E. coli is a metabolically versatile bacterium that is able to grow
under aerobic and anaerobic conditions
. Adaptation to environ- ments with different O2 concentrations, which is vital for E. coli competitiveness and growth, requires reprogramming of gene ex- pression and cell metabolism.
What is the pH of Alcaligenes faecalis?
It is also pH-dependent in vitro with an optimum
between 5.8 and 7
.
Is Alcaligenes faecalis harmful to humans?
Alcaligenes faecalis is a species of gram-negative, rod-shaped, aerobic bacteria commonly found in the environment. A. faecalis-associated nosocomial infections are common in hospitalized patients, but
serious life threatening infections are rare
.
What antibiotics are used to treat Alcaligenes faecalis?
The best sensitivity rate to Alcaligenes faecalis was 66.7% for three antibiotics (
imipenem, meropenem, and ceftazidime
) in 2019. Two antibiotics (ciprofloxacin and piperacillin/tazobactam) sensitivity rates to A. faecalis were less than 50%.
What diseases are caused by Alcaligenes faecalis?
A. faecalis has been associated with
endocarditis, bacteremia, meningitis, endophthalmitis, skin and soft tissue infections, urinary tract infections, otitis media, peritonitis, and pneumonia
[1, 2, 7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28].
What is the colony morphology of E coli?
coli colony is
off-white or beige in color with a shiny texture
. It often looks like mucus or a cloudy film over the whole surface of the plate. An E. coli colony is slightly raised and has an entire, fixed margin and a steady growth pattern, creating concentric growth rings in the colony.
Is a faecalis Alkaliphile?
faecalis could still slightly show pH tolerance. The acid tolerance response is related to the ability of certain E. faecalis strains to grow in environments with an
alkaline pH
(9.5–12) within 48–72 hours
12
.
How can colonies be used to identify bacteria?
Colony morphology is a method that scientists use to describe the characteristics of an individual colony of bacteria growing on agar in a Petri dish. It can be used to help to identify them. A
swab from a bin spread directly onto
nutrient agar. Colonies differ in their shape, size, colour and texture.
How do you know if a bacteria is aerobic or anaerobic?
Aerobic and anaerobic bacteria can be identified by
growing them in test tubes
of thioglycollate broth: 1: Obligate aerobes
Does E. coli prefer aerobic respiration?
Escherichia coli is a metabolically versatile bacterium that is able to grow in the presence and absence of oxygen. To achieve this, it exploits a flexible biochemistry in which
aerobic respi- ration is preferred to anaerobic respiration
Is E. coli gram positive?
Escherichia Coli is a Common Intestinal Bacteria. E. coli is a
Gram negative
anaerobic, rod-shaped, coliform bacteria of the genus Escherichia, commonly found in the lower intestine of humans and animals.
