Table 1:

Common organisms found in normal and diseased ears

Microorganism found in
Normal earsEars with otitis externa
Malassezia pachydermatis*Malassezia species*
Lipid-dependent Malassezia species (eg, Malassezia furfur and Malassezia obtusa)Staphylococcus pseudintermedius*
Staphylococcus pseudintermedius*Pseudomonas aeruginosa*
Staphylococcus schleiferi subspecies coagulansProteus mirabilis*
Coagulase-negative Staphylococcus species β-streptococci
Bacillus species*Corynebacterium species
Corynebacterium speciesEnterococcus species
Streptococci speciesEscherichia coli
Micrococcus species
  • * Organisms are common

  • May not be reported by some laboratories as considered ‘normal’