Gram-Positive Bacteria:
Bacteria that retain the crystal violet stain and appear purple under the microscope.
Common gram-positive bacteria include Staphylococcus species and Streptococcus species.
Gram-Negative Bacteria:
Bacteria that do not retain the crystal violet stain and appear pink or red under the microscope.
Common gram-negative bacteria include Escherichia coli and Pseudomonas aeruginosa.
Fungi:
Fungi may also be detected in the pus sample and can appear as yeast or mold forms.