Which One of the Following is an Irregular,gram-Positive Rod

Question

Which one of the following is an irregular,gram-positive rod?
A)Bordetella pertussis
B)Corynebacterium diphtheriae
C)Burkholderia pseudomallei
D)Streptococcus pyogenes
E)Pneumocystis jirovecii

Accepted Answer

Corynebacterium diphtheriae is an irregular, gram-positive rod and is the only option listed. Bordetella pertussis is a small, aerobic, gram-negative coccobacillus. Burkholderia pseudomallei is a gram-negative, bipolar-staining, aerobic rod. Streptococcus pyogenes is a gram-positive cocci in chains. Pneumocystis jirovecii is an atypical fungus and does not fit the description of a gram-positive rod.