What does cytochrome oxidase negative mean?

This does NOT mean that they are strict aerobes. Bacteria that are oxidase-negative may be anaerobic, aerobic, or facultative; the oxidase negative result just means that these organisms do not have the cytochrome c oxidase that oxidizes the test reagent. They may respire using other oxidases in electron transport.)

Is Enterobacter a lactose fermenter?

Lactose usually is fermented rapidly by Escherichia, Klebsiella and some Enterobacter species and more slowly by Citrobacter and some Serratia species. A battery of tests for biochemical properties is required to identify the coliforms and Proteus to the species level.

Does Pseudomonas maltophilia ferment lactose?

Pseudomonas aeruginosa is a gram-negative bacillus found widely in nature, in soil and water. P. aeruginosa has few nutritional requirements and can adapt to conditions not tolerated by other organisms. It does not ferment lactose or other carbohydrates but oxidizes glucose and xylose.

What gram-negative rods are lactose fermenting?

E. coli are facultative anaerobic, Gram-negative bacilli that will ferment lactose to produce hydrogen sulfide.

How are oxidase negative and catalase positive media different?

• Grow a wide range of temperature in ordinary media. can diagnosis on selective and differential media • Most are reduce nitrates to nitrites • All ferment glucose with acid production. •Oxidase negative. Catalase positive • Release endotoxin from their cell wall. Some release exotoxin.

Is the Klebsiella oxytoca Mr positive or VP negative?

It is indole positive, MR positive, VP negative, and Simmons citrate negative. Klebsiella oxytoca is a facultatively anaerobic gram-negative rod. It is nonmotile and a lactose fermenter. It is indole positive, often MR negative, VP positive, and Simmons citrate positive.

Which is lactose positive or lactose negative bacteria?

Lactose fermenting (Lactose positive): Enterobacter spp, Escherichia coli, Klebsiella spp Citrobacter spp*, Serratia spp* Non lactose-fermenting (Lactose negative): ● Oxidase (-): Acinetobacter spp , Burkholderia spp, E. coli Proteus spp, Salmonella spp, Shigella spp, Serratia spp*, Stenotrophomonas maltophilia ● Oxidase (+):

Which is an oxidase negative Gram negative fermenter?

coliforms (enterobacilli) Comprises the following bacterial groups Oxidase negative Enterobacteriaceae •a. Lactose-fermenters •Escherichia spp. •Klebsiella spp. •Enterobacter spp. •Citrobacter spp. •b. Non-lactose fermenters •Salmonella spp. •Shigella spp. •Proteus spp