Microbiology 9th Edition by Laura Black, Jacquelyn Black

Exercise 29

All of the following are true about ear infections EXCEPT:
(a) Middle ear infections (otitis media) often produce a puslike exudate (referred to as otitis media with effu sion) due to infection by genera of Streptococcus, Hae mophilus, or various species of anaerobes.
(b) External auditory canal (otitis externa) infections are typically caused by Staphylococcus aureus or Pseudo monas aeruginosa.
(c) After successful treatment of middle ear infections with antibiotics, sometimes tubes are inserted to prevent flu id accumulation, repeated infections, and hearing loss.
(d) Pseudomonad infections are common in swimmers because these organisms are able to produce a soluble greenish-blue pigment.
(e) Repeated ear infections in children often decrease markedly because as the child ages, the Eustachian tube changes shape and develops an angle that prevents most organisms from reaching the middle ear.