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Table 1 Bacteria commonly found on the surfaces of the pharynx

From: Changes in pharyngeal aerobic microflora in oral breathers after palatal rapid expansion

Staphylococcus epidermidis ++ Streptococcus pyogenes* + Mycoplasmas +
Staphylococcus aureus* + Neisseria sp. ++ Mycobacteria +/-
Streptococcus mitis + Klebsiella pneumoniae +/- Lactobacillus sp. +
Streptococcus salivarius ++ Neisseria meningitidis* ++ Hemophilus influenzae +
Streptococcus mutans * + Corynebacteria + Pseudomonas aeruginosa +/-
Enterococcus faecalis* +/- Actinomycetes + Proteus +
Streptococcus pneumoniae + Spirochetes + Enterobacteriaceae (Escherichia coli)* +/-
  1. ++ = nearly 100% + = common +/- = rare * = potential pathogen.
  2. Asterisks indicate members of the normal flora that may be considered major pathogens of humans.