An organism, observed on direct Gram stain from a clinical specimen, does not grow on blood or chocolate agars incubated at 35C in CO2. This can be explained by all of following statements except
A) the organism is dead due to previous antibiotic therapy.
B) the organism requires nicotinamide adenine dinucleotide for growth.
C) the organism is fastidious and is not being provided the growth factor it needs.
D) the organism is an anaerobe.
Question 2
The Gram stain of a vaginal discharge is reviewed for the presence of bacterial vaginosis. The microbiologist assigns a score of 2 to the slide. This means there is/are
A) a predominance of gram-positive rods and a limited number of gram-negative rods.
B) gram-negative rods and gram-positive rods are present in equal amounts.
C) no organisms present.
D) a predominance of gram-negative rods and a limited number of gram-positive rods.
