Exam 16: Erysipelothrix, Lactobacillus, and Similar Organisms

A gram-positive bacillus identified as Lactobacillus is isolated in large quantities from the urine of a 16-year-old female.Based on this information,the patient should receive which antibiotic?

A 28-year-old woman suspected of having sepsis caused by G.vaginalis has multiple blood cultures drawn;however,all sets were negative.Which one of the following statements explains this discrepancy?

A catalase-negative,non-spore forming,and gram-positive rod that is not acid-fast could possibly belong to which group of bacteria?

The reverse Christie,Atkins,Munch-Petersen (CAMP)test is positive for these curved gram-positive bacilli.Which β-hemolytic organism is used in conjunction with this organism in the reverse CAMP test?

Which organism is nonhemolytic on 5% sheep blood agar but hemolytic on human blood?

A catalase-negative,non-spore forming,nonbranching,gram-positive rod that produces hydrogen sulfide when inoculated into triple sugar iron (TSI)agar is most likely:

To test the validity of TSI media,quality control should be performed using which two organisms?

A farmer has a localized,painful skin infection.Cultures are set up,and α-hemolytic,catalase-negative,and gram-positive bacilli are isolated.Based on this information,which of the following biochemical results are expected-urease,H₂S production in TSI,and nitrate reduction?

Clue cells are associated with which gram-positive bacilli?

The wet mount and Gram stain of vaginal secretions from a patient who has bacterial vaginosis caused by Gardnerella vaginalis will reveal large: