Which organism is Voges-Proskauer negative?

Edwardsiella is indeed classified as Voges-Proskauer negative. The Voges-Proskauer test is an important biochemical test used to determine if an organism can produce acetyl methyl carbinol (acetoin) during the fermentation of glucose.

In the case of Edwardsiella, this organism does not possess the ability to produce acetoin, resulting in a negative Voges-Proskauer reaction. This characteristic helps distinguish it from other enteric bacteria that may exhibit a positive reaction, such as Klebsiella and Enterobacter, which are known to utilize the 2,3-butanediol fermentation pathway. Serratia marcescens, another organism often tested, can also yield a positive result in the Voges-Proskauer test due to its capability to produce acetoin.

Recognizing the biochemical properties of Edwardsiella is crucial for accurate identification and understanding of its differentiated metabolic pathways, which aids in proper laboratory diagnostics.