Analytical Profile Index API 20E. API 20E system. The API 20E is a standardized identification system for Enterobacteriaceae and other non-fastidious, Gram negative rods.
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NOTE : squeeze bottle. The indole production test must be performed last since this reaction releases gaseous products which interfere with the interpretation of other tests on the strip.
Reduction of nitrates to nitrites (NO2) and N2 gas (N2) squeeze bottle.