Interpretation of Gram’s Stain

Gram Positive

Difference between Staphylococcus and Streptococcus

• Some important bacteria cannot be seen with Gram’s stain because they are too small or too slender or do not retain the stain. These bacteria include Treponema pallidum (syphilis*)*, Borrelia burgdorferi (Lyme disease), Leptospira interrogans, Bartonella henselae (cat scratch disease), Coxiella burnetii (Q fever), Rickettsia spp., Chlamydia spp., Mycoplasma spp., and Ureaplasma spp