Why can direct microscopy not be used to provide a presumptive identification of the enteric bacteria?
A) Some members of the genus Gram stain weakly.
B) The microscopic characteristics are indistinguishable from other gram-negative bacteria.
C) Some members of the genus do not decolorize well and appear gram-positive.
D) Some members have very thick capsules, and these do not allow the penetration of the Gram stain.

Question

Quizplus · Accepted Answer

The microscopic characteristics of enteric bacteria are indistinguishable from other gram-negative bacteria, making it impossible to provide a presumptive identification based solely on direct microscopy.

Why Can Direct Microscopy Not Be Used to Provide a Presumptive