Ears Infection 2017, Dr.Babiker Saad Almugadam Yousif, University of El Imam El Mahdi, Kosti city, Sudan

1. Ears infection
Almugadam B Saad
Full name
Babiker Saad Almugadam Yousif
Lecturer of medical microbiology
Faculty of medical laboratory sciences
University of El Imam El MahadiUniversity of El Imam El Mahadi
Kosti-Sudan
MSc University of Khartoum
BSc University of El Imam El Mahadi

2. Ears infection
learning objectives:
-Anatomy
-Function
-Defense mechanismEar -Defense mechanism
-Normal flora
-Microbial infection
-Lab diagnosis
Ear

3. Anatomy of Ears
-External ear
Consist of -Medial ear
-Internal ear

4. Function of Ears:
- Part of auditory system ,assist in body balance and
sound hearing
Defense mechanism:Defense mechanism:
Include :
Normal flora
Lysozymes
Secretary IgA

5. Normal flora :
-Include :
Found only in external ear(Middle and Internal ear are sterile)
S.epidermidis
S.auerus
Candida
ColiformColiform
Lactobacilli

6. Ears infection
(( Microbial infection))
-Classify according to :
A- Otitis externa :infection of external
Site of ear
infection B- Otitis media: Infection of middleinfection B- Otitis media: Infection of middle
ear
A- Acute
Onset
B- Chronic

7. Bacterial ear infection
Causative agent
Fungal ear infection (Otomycosis)

8. Otitis externa
-infection of external ear part
acute
- can be or chronic
or malignant
- Acute can be localized- Acute can be localized
or diffuse (swimmers ear)
- Cause mainly by S.auerus , S.pyogen and P.aeruginosa

9. Otitis Media
-infection of middle ear
A- acute
- can be B- or chronic supportive otitis media
(CSOM)
A- acute otitis media :
It viral infection (mainly by RSV and Influenza) , can
complicate by bacteria which include S.pneumoniacomplicate by bacteria which include S.pneumonia
,H.influenza , S.auerus , M.catarrhalis and S.pyogen.
B- chronic supportive otitis media :
Pseudomonas , anaerobes (bacteroides) , protus , coliform
, S.auerus , candida , aspergillus , dermatophytes.

10. Chronic ear infection :
-cause by bacteria (as bacteroides)or fungi
Otomycosis :
-It fungal ear infection , chronic cause by candida ,
aspergillus , dermatophytes and phaycomycetes.

11. Lab diagnosis of ear infection
-Specimen : Ear swab , ear discharge
-Transportation : Amies transport media
-Microexamination: Gram stain
KOH
PAS
-Culture :
Routine : BA , Choclate agar and MaCconkey
Additive media :
An O2 BA in chronic ear infection
Sabroad
KVBA