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Systematic Microbiology Revision
Supervised by
:
Prof. Dr. Mohamed SherifBy:
Mohamed El-Badry
Mahmoud El-Mahallawy
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Medical Microbiology
Microorganisms
Bacteria Fungi Viruses
Cocci Bacilli Spirals DNA viruses RNA viruses
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Cocci
Gram +ve Gram -ve
Neisseria
Bunches Chains Diplo Diplo
Staphylococci Streptococci Pneumococci
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S. aureusmorphology
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Staphylococci
Definition
Gram-positive cocci arranged in bunches, non motile, non spore -forming
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Classification of Staphylococci
Classified according to the color of the colonies into :
Staphylococcus
saprophyt icus (Ci trus)
Staphylococcus
epidermidis (albus )
Staphylococcus
aureus
Golden Yellow Colonies White Colonies Lemon Yellow Pigment
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2. Direct Microscopic examination (Direct Film): Gram
positive cocci arranged in bunches, non motile, non-sporeforming among pus.
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b. Effect of colonies on Blood Agar:
Colony
Complete Zone of
haemolysis (-
hemolysis) around
colony due to production
of haemolysin
S. aureus produce haemolysin that destroy RBCs in blood agar medium
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Indirect film (Film from culture)
Gram-positive cocci arranged in bunches from culture
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Biochemical Reactions:
Coagulase production:
Tube Method: to detect soluble coagulase
Slide Method: to detect bound coagualse
Coagulase-positive Staphylococci:
Staphylococcus aureus
Coagulase-negative Staphylococci:
S. epidermidis
S. saprophyticus
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Cutaneous lesions of S. aureus
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Staphylococcal osteomyelitis in a long bone
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Stye
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Impetigo
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scalded skin syndrome
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Toxic shock syndrome
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Toxic shock syndrome
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SSSTSS
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TSS SSS TSS
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1 normal
microflora
2impetigo
11 respiratory infections
8 meningitis
3 furuncle, carbuncle
4 wound inf., abscesses
5 spread via lymphatic
and blood ways
6 osteomyelitis
7 endocarditis
10nephritis
9 enteritisfood poisoning
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Streptococci
DefinitionGram-positive cocci arranged in chains, non motile, non spore-forming
Sometimes capsulated (Strept. Pneumoniae)
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Classification
Streptococci
Aerobic Anaerobic
Peptostreptococcus-hemolytic -hemolytic Non-hemolytic
St. viridans St. pyogenes St. faecalis
(Enterococcus
faecalisSt. pneumoniae
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Freshly isolated Streptococcus
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Streptococcus pneumoniae
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- Haemolytic Streptococci
Viridans Streptococci Streptococcus pneumoniae
Diseases
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Diagnosis of Sub Acute Bacterial Endocarditis
Incubate
37 oC,
24 h.
Sub
Cu
lture
Blood Culture
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-hemolytic streptococci Group A Lancifield
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Direct microscopic examination
showing Gram positive cocci,
arranged in chains among pus
Indirect microscopic examination
showing Gram positive cocci,
arranged in chains from culture
Treatment (The drug of Choice)
Penicillin
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Acute follicular tonsillitis
Scarlet FeverNote the strawberry tongue of
scarlet fever
Impetigo
Erysipelas
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Erysipelas
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Acute follicular tonsillitis
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Scarlet fever
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Neisseria
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Acute gonorrheal male - showing urethral discharge
Neisseria gonorrhea
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N. gonorrhoeae N. meningitides
Direct Examination (Stained smear) will show:
Gram-negative kidney-shaped diplococci, Intracellular and extracellular
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Ophthalmia neonatorumNon venereal gonococcal infection
Neisseria gonorrhea
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meningo coccus
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Neisseria Meningitidis
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Lumbar Puncture
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Gram Positive Bacilli
Aerobic Anaerobic
Spore-forming Non-spore forming
Bacillus Corynebacterium
Spore-forming
Clostridium
Anthracis
Anthracoid
diphtheriae
diphtheroid
botulinum
Perfringens
tetani
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Pneumonic Anthrax
Wool sorters disease
Cutaneous Anthrax
Malignant Pustule
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Corynebacterium
Definition
Aerobic, non spore forming, Gram-positive bacilli arranged in chinese letters
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Diphtheria
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Metachromatic
granules
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Lofflers serum Blood Tellurite
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Clostridium
Definition
Anaerobic, Gram-positive spore-forming bacilli
Spore
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Clostridium tetani
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Tetanic neonatorum
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Treatment of Tetanus
Antitoxic serum Penicillin
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Immunization
(Diphtheria, Pertussis, Tetanus)
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A film of Cl. tetani stained by Gram showing characteristic durm-stick
appearance due to terminal spherical spores
Microscopic Examination
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Culture
Anaerobic culture (using
anaerobic gas pak jar)
on blood agar
Anaerobic culture
(using anaerobic medium)
on Robertson Cooked meet
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Clostridium causing gas gangrene
Saccharolytic Proteolytic
C. perfringens (welchii) C. sporegenes
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Culture
Anaerobic culture
(using anaerobic medium)
on Robertson Cooked meet
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Treatment of Gas Gangrene
1. Removal of necrotic tissues or even amputation
2. Antitoxic serum
3. Penicillin or clindamycin
4. Washing with H2O2
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Mycobacterium
(Acid-Fast Bacilli)
The Cell wall is rich in lipid (mycolic acid) making the cell wall resistant to:
Disinfectants
StainsGrams Stain
Decolorization by acids thus they are termed acid fast bacilli
Mycobacterium
Tuberclosis
Tubercle Bacilli
(T.B.)
saprophyticusLeprae
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A Sputum film stained by Ziehl-Nellsen stain showing the
tubercle bacili as pink rods in a blue background.
Mycobacter ium tuberclosis (T.B )
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Lowenstein Jensen media
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Treatment
PASA
Ethambutol
Streptomycin
INH
Remactan
cycloserine
Immunization
BCG
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Mycobacterium leprae
Ziehl nellsen Modified Ziehl nellsen
T.B.
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Mycobacterium leprea
LeprosyLLTT
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Treatment
Dapson (Sulfa)
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www.orl.cz/choroby/ustni/jazyk/zanet/1
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Treponema pall idum
Narrow coils
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Secondary Syphilis
Skin Rash Condylomata lata
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Tertiary syphilis
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Treponema pertenue
Yaws
Non venereal skin infection
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Borrelia spp.
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Giemsa Stain of Borrelia Gram Stain of Borrelia
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Vincents Angina
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Cultivation of Viruses
Figure 13.7
Chick embryo
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Herpangina caused by coxackie virus
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Jaundice casued by Hepatitis A virus
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Influenza
Spread by droplet
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Point mutation of HA and NAgenes
ANTIGENIC DRIFT
ANTIGENIC SHIFT
Genetic Reassortment
Human H3N2
Avian H3N8
Human H2N2Generation of Novel Influenza A Viruses
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d h l
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Treatment and Prophylaxis
Tam fluAmantadine
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k lik d b M l i
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kopliks spots caused by Measles virus
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S t f HIV i f ti
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Symptoms of HIV infection
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didi i
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candidiasis
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Herpes simplex type 1
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Herpes simplex type 1
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human papilloma virus
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human papilloma virus
Treatment
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Treatment
Epstein Barr virus
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Epstein Barr virus
Burkitt's lymphoma
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