The Normal Flora: Upper Respiratory Tract

Nose, nasopharynx & sinuses

Staphylococcus epidermidis
Staph. aureus (especially in hospital staff)
streptococci (including S. pyogenes & S. pneumoniae)
Haemophilus sp.
Neisseria sp

Mouth & throat

streptococci (mainly S. mitis & S. salivarius )
diphtheroids
anaerobes (e.g. Fusobacterium sp.)
Staph. epidermidis
spirochaetes