Microbiology General 1e0342d4 Phenylalanine deaminase test is positive in ? A Salmonella B Proteus C Vibrio cholerae D Helicobacter High-Yield Explanation Ans. is 'b' i.e., Proteus The distinctive character of proteus genus is deamination of phenyl alanine to phenyl pyruvic acid (PPA + ye)