The most important urease producers are Proteus, Klebsiella, Pseudomonas, and Staphylococcus species (4) and their presence in urine can be detected using the urea rapid test (5).

What does it mean if a bacteria is urease positive?

The urease test identifies those organisms that are capable of hydrolyzing urea to produce ammonia and carbon dioxide. It is primarily used to distinguish urease-positive Proteeae from other Enterobacteriaceae. Two media types are commonly used to detect urease activity.

What bacterial species produces urease?

Urease is produced by numerous taxonomically diverse bacterial species, including normal flora and nonpathogens. Also, urease has been demonstrated as a potent virulence factor for some species, including Proteus mirabilis (51), Staphylococcus saprophyticus (36), and Helicobacter pylori (23). Urease is central to H.

Is Proteus urease positive?

This species can be identified as a Gram-negative rod that is motile, urease-positive, lactose-negative, indole-negative, and produces hydrogen sulfide (1). It is a member of the same bacterial family (Enterobacteriaceae) as E. coli.

What is rapid urease test positive?

Rapid urease test, also known as the CLO test (Campylobacter-like organism test), is a rapid diagnostic test for diagnosis of Helicobacter pylori. The basis of the test is the ability of H. pylori to secrete the urease enzyme, which catalyzes the conversion of urea to ammonia and carbon dioxide.

Which are urease-positive fungi?

Many fungi pathogenic to humans have urease activity, among which are Cryptococcus neoformans, Coccidioides immitis, Histoplasma capsulatum, Sporothrix schenckii, and species of Trichosporon and Aspergillus.

What organisms are urease negative?

Examples: Proteus spp, Cryptococcus spp, Corynebacterium spp, Helicobacter pylori, Yersinia spp, Brucella spp, etc. Negative Reaction: No color change. Examples: Escherichia, Shigella, Salmonella, etc.

What organisms have urease?

Urease is produced by many different bacteria [8-17], fungi [3, 18, 19], plants [1, 3, 8, 20, 21] and even some invertebrates [20, 21]. Microorganisms with ureolytic properties were found in soil and water as well as in human and animal bodies [8].

What does negative urease test mean?

Rapid urease tests are fast, inexpensive, and easy to perform. A limitation is that this method requires a high density of bacteria in the specimen. Negative results could mean that the level of bacteria in the specimen obtained is low.

What causes H pylori infection?

H. pylori bacteria may be passed from person to person through direct contact with saliva, vomit or fecal matter. H. pylori may also be spread through contaminated food or water.

Can Helicobacter pylori be cured?

pylori infection are not cured after completing their first course of treatment. A second treatment regimen is usually recommended in this case. Retreatment usually requires that the patient take 14 days of a proton pump inhibitor and two antibiotics.

Is Staphylococcus aureus urease positive?

Abstract. Urease is a virulence factor for the Gram-positive urinary tract pathogen Staphylococcus saprophyticus. The susceptibility of this enzyme to chemical inhibition was determined using soluble extracts of Staph. saprophyticus strain ATCC 15305.

Is Klebsiella urease positive?

Klebsiella spp. are non-motile, ornithine decarboxylase, gelatinase and indole negative. They are capsulate, ferment glucose, lactose and inositol, and are citrate, urease, and Vokes-Proskaüer positive.

Is Cryptococcus neoformans urease positive?

Introduction. One of the hallmarks that differentiate Cryptococcus neoformans from other white clinical yeasts is its ability to produce urease. Urease-negative C. neoformans strains have rarely been isolated from patients or the environment (1), and the enzyme is recognized as an important virulence factor in C.