PYR test

The PYR test is used to rapidly distinguish Streptococcus pyogenes from other β-haemolytic streptococci. Streptococcus pyogenes is manifested by the presence of the enzyme PYRase (pyrrolidonyl arylamidase), which causes disc reddening. The disc is incubated for 1-2 minutes at laboratory temperature. It is also used to distinguish Enterococcus from group D streptococci (S. bovis, S. equinus).

Results:

• Positive – reddening (Streptococcus pyogenes, Enterococcus spp.).

Links

Related articles

• Bacitracin test
• CAMP test
• Catalase test
• Optochin test
• Plasmacoagulase test
• Streptococcus pyogenes

Sources

• BEDNÁŘ, M – FRAŇKOVÁ, V – SCHINDLER, J, et al. Lékařská mikrobiologie – bakteriologie, virologie, parazitologie. 1. edition. Praha : Marvil, 1996. 558 pp. ISBN 80-238-0297-6.

• -, -. ITEST PYR TEST [online]. [cit. 2012-01-13]. <https://www.itest-plus.cz/diagnosticke-pripravky-cz/ostatni-diagnosticke-soupravy-cz/itest-pyr-test-cz>.