Quiz 2: Neisseria, Moraxella, and Enterobacterales

The meningococcal vaccines stimulate antibody production against:

• capsule

Your patient is experiencing fever, chills, an intense headache, and a stiff neck. The following image shows what was seen upon Gram stain of their cerebrospinal fluid. What is the causative agent?

• N. meningitidis

You have isolated an oxidase-positive, Gram-negative diplococcus from the sputum of a patient with COPD. A rapid butyrate esterase disk test is positive. What is the identification?

• Moraxella catarrhalis

Which organism produces a deep red-to-pink pigment called prodigiosin that is most pronounced on MacConkey agar?

• Serratia marcescens

True or False: Gonorrhea is the most common bacterial sexually transmitted infection in the United States.

• False

Which organ harbors Salmonella species in the carrier state?

• Gallbladder

Cefsulodin-Irgasan-Novobiocin (CIN) agar is used to recover which organism?

• Yersinia enterocolitica

Which organism is oxidase positive?

Morganella morganii

Proteus mirabilis

Klebsiella oxytoca

Plesiomonas shigelloides

• Plesiomonas shigelloides

Which genus is nonmotile?

Escherichia

Klebsiella

Salmonella

Proteus

• Klebsiella

Which letter is used to designate the flagellar antigen found on members of the Enterobacterales?

• H

An isolate of Neisseria recovered from a throat culture demonstrates utilization of glucose, maltose, and lactose. What is the identification?

• Neisseria lactamica

Sorbitol MacConkey agar (SMAC) is a selective and differential culture media used to detect which organism?

• Escherichia coli O157

Which Shigella species is ornithine decarboxylase positive and the most common species in the United States?

• S. sonnei

Which organism demonstrates swarming motility on agar plates?

• Proteus vulgaris

True or False: Outbreaks of Cronobacter sakazakii have been linked to powdered infant formula.

• True

Which organism can mimic Salmonella species in stool cultures due to H₂S production?

• Citrobacter freundii

Which organism is the causative agent of Granuloma inguinale?

• Klebsiella granulomatis

Which organism is the causative agent of Plague?

• Yersinia pestis

Culture for N. gonorrhoeae is still recommended over molecular methods for which site of infection?

• Eye

Which organism is the causative agent of Typhoid fever?

• Salmonella Typhi