Which statement is NOT true about Aeromonas hydrophila?

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Multiple Choice

Which statement is NOT true about Aeromonas hydrophila?

Explanation:
Aeromonas hydrophila typically shows a biochemical pattern that includes beta-hemolysis on blood agar, catalase positivity, and oxidase positivity, along with beta-galactosidase activity detected by the ONPG test. The ONPG test reveals whether an organism has beta-galactosidase; Aeromonas species usually produce this enzyme, so they yield a positive ONPG result. Therefore, the statement that it is negative for ONPG contradicts the common enzymatic profile of this organism. The other traits—beta-hemolysis, catalase positivity, and oxidase positivity—fit the expected phenotype and remain true.

Aeromonas hydrophila typically shows a biochemical pattern that includes beta-hemolysis on blood agar, catalase positivity, and oxidase positivity, along with beta-galactosidase activity detected by the ONPG test. The ONPG test reveals whether an organism has beta-galactosidase; Aeromonas species usually produce this enzyme, so they yield a positive ONPG result. Therefore, the statement that it is negative for ONPG contradicts the common enzymatic profile of this organism. The other traits—beta-hemolysis, catalase positivity, and oxidase positivity—fit the expected phenotype and remain true.

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