Respiratory Tract

Normal Oropharyngeal Flora

Viridans Group Streptococci
Non-haemolytic Streptococci
Coagulase negative Staphylococci
Anaerobes (Prevotella spp, Porphyromonas spp, Fusobacterium spp)
Neisseria spp (except N. gonorrhoeae)
Corynebacterium spp
Micrococcus spp/Macrococcus spp
Rothia spp
Lactobacillus spp
Enterococcus spp
Bacillus spp

May be part of normal flora but may be potential pathogens in lower respiratory tract

Streptococcus pneumoniae
Haemophilus influenzae/parainfluenzae
Moraxella catarrhalis
Staphylococcus aureus
ß-haemolytic Streptococci
Enterobacteriaceae
Pseudomonas aeruginosa
Other non-fermentative bacilli
Neisseria meningitidis
Candida spp
Corynebacterium pseudodiphtheriticum
Pasteurella spp