HACEK group Flashcards
HACEK stands for___.
Haemophilus spp. (Aggregatibacter aphrophilus)
• Aggregatibacter actinomycetemcomitans
• Cardiobacterium hominis
• Eikenella corrodens
• Kingella spp
T or F
HACEK group is dysgonic (slower or poorer growing).
False (ACEK)
Aggregatibacter actinomycetemcomitans formely known as
Actnobacillus actinomycetemcomitans
Aggregatibacter aphrophilus formely known as __.
H. aphrophilus
Which is not a general characteristic of HACEK group?
A. Both fermentative and non-fermentative
B. Predilection for attachment to heart valves (Endocarditis)
C. Normal flora of the oral cavity
D. Alpha hemolytic.
D.
Risk factors for endocarditis of the HACEK group include ___.
tooth extraction
history of endocarditis
gingival surgery
heart valve surgery
mitral valve prolapse
Aggregatibacter aphrophilus
The meaning of “aphro” ____.
Foaming (needing a high concentration of CO2
)
Aggregatibacter aphrophilus formely known as __.
H. aphrophilus and
H. paraphrophilus
Most prevalent spp. Involved in endocarditis?
A. Aggregatibacter aphrophilus)
B. Eikenella corrodens
C. Cardiobacterium hominis
D. Kingella spp
A.
Formerly in the genus Actinobacillus but now they are in Aggregatibacter.
Aggregatibacter actinomycetemcomitans
Which member of the HACEK group can infect the humans through bite and contact?
Aggregatibacter
actinomycetemcomitans
Aggregatibacter
actinomycetemcomitans is an etiologic agent of ___.
Periodontitis
Major virulence factor of A.
actinomycetemcomitans.
collagenase and leukotoxin
A. actinomycetemcomitans ferment ___ with the addition of serum.
CHO
Characteristics of central colonies of A. actinomycetemcomitans within 48 hours.
Star shape with 4 to 6 points
Appearance of A. actinomycetemcomitans in broth.
granular and adheres to the sides of the tube
Which is not a characteristics of Cardiobacterium hominis?
A. Pleomorphic
B. nonmotile,
C. Translucent
D. Fastidious
C.
Member of the HACEK group that usually present in GIT and infecf the aortic valve frequently.
Cardiobacterium hominis
T or F
Cardiobacterium hominis usually shows false gram (+)
True
Does the Cardiobacterium hominis pit the agar plate?
Yes
Characteristics of Cardiobacterium hominis.
Spindle shape and opaque
Infections often occur as a result of trauma, especially after human bites or fights.
Eikenella corrodens
They are present because of Poor dental hygiene and oral surgery.
Eikenella corrodens
T or F
Eikenella corrodens is sacchrolytic.
False (asacchrolytic)
Least common isolate in endocarditis.
Eikenella corrodens
Eikenella corrodens produces what color of pigment?
Yellow pignment
Appearance of Eikenella corrodens on SBA.
slight greening effect due to growth
They decolorization in gra stain
Kingella spp.
Kingella Colonize URT especially the ___.
Tonsils
Kingella can grow in _____. It also resembles ____.
Thayer martin agar
N. gonorrhoeae
It produce a yellow-brown pigment
K. kingae
Two types colonies of Kingella.
- spreading, corroding
-smooth, convex, B-hrmolysis
Major gram-negative kingella spp. isolated from degenerative joint and bone infections (osteoarthritis) in ___
Children < 3yrs. Old
Shape of kingella spp. Microscope.
Square ended shape
