Lab 10 Microbial Flora of Skin

Resident Flora

Regularly found on skin

Streptococcus viridans, Streptococcus faecalis, Enterococc(Gram Positive)

Staphylococcus

(S. epidermidis, S. aureus)

Diphtheroid bacilli

Corynebacterium, Propionibacterium)

Bacillus spp

Aerobic spore forming bacilli. Gram positive

Gram Negative

coliform bacilli, fungi, and yeast

Blood agar

Enriched and differential medium. Useful to observe hemolytic properties of bacteria

Transient Flora

Not usually found on skin, but are still present

Can be pathogenic or nonpathogenic

Beta Hemolytic

E. Coli, S. aureus, and Group A streptococcus

Strepto species

Catalase negative

Staphylo species

Catalase positive

RBC

Catalase positive