Many gastrointestinal or urinary tract pathogens produce urease, enabling the detection of urease to be used as a diagnostic to detect presence of pathogens.
Urease-positive pathogens include:
Proteus mirabilis and Proteus vulgaris
Ureaplasma urealyticum, a relative of Mycoplasma spp.
Nocardia
Campylobacter ureolyticus
Cryptococcus spp., an opportunistic fungus
Helicobacter pylori
Certain Enteric bacteria including Proteus spp., Klebsiella spp., Morganella, Providencia, and possibly Serratia spp.