Determining urease activity and growth on niger seed agar is helpful in determining which type of yeast?

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The rapid urease test (Procedure 62-2)is a most useful tool for screening for urease-producing yeast recovered from respiratory secretions and other clinical specimens.An alternative to traditional urease testing is the rapid selective urease test (Procedure 62-3).This method appears to be useful in rapidly detecting C.neoformans.Using these screening tests is helpful to make a presumptive identification of C.neoformans.In instances in which inoculum is limited,the laboratorian must use tests that can be performed and then prepare a subculture so that additional tests can be performed later.Often,inoculating the organism onto the surface of a plate of niger seed agar is just as fast;the results may be obtained during the same day of incubation at 25°C.This is discussed further in this section.

Determining Urease Activity and Growth on Niger Seed Agar Is