To the Editor: Varibaculum cambriense is an anaerobic, gram-positive, diphtheroid
bacterium that was described by Hall et al.
Due to numerous shared characteristics, Rhodococcus is commonly misidentified as diphtheroid
contaminant and normal flora, Mycobacterium, Nocardia, Bacillus, Micrococcus organisms or even fungi (6).
Multiple urine cultures revealed staphylococci, streptococci, Escherichia coli, and diphtheroid
Even though it grows well on commonly used clinical laboratory media, it can be confused as a streptococcus or diphtheroid
and may be missed by a novice microbiologist.
rhusiopathiae as a nonpathogenic Gram-positive bacillus, such as a diphtheroid
skin contaminant, or as Bacillus or Clostridium species if identification is incomplete.
If, for example, a diphtheroid
is isolated from a spinal fluid specimen, it would be important to rule out Listeria with a hanging drop motility test.