Gram positive anaerobic cocci

Question 1

What is Peptostreptococcus species weak to?

Answer 1

○ Beta-lactam antibiotics
○ Penicillin G being the most effective

Question 2

Penicillin G

Answer 2

○ first generation penicillin that is used to treat infections
○ Administered as an IV

Question 3

Peptostreptococcus anaerobius

Answer 3

○ Causes infections in the brain, ear, jaw, pleural cavity, and urogenital tract
○ Small grey to white colonies that have a sweet but putrid odor on ANBAP

Question 4

Parvimonas micra

Answer 4

Causes infection such as brain abscesses, otitis media, human bite infections, septicemia, abdominal infections and prosthetic joint infections

Question 5

Peptinophilus asaccharolyticus

Answer 5

○ ANBAP small yellow colonies
○ SPS resistant
○ catalase (-)
○ indole (+)

Question 6

Anaerococcus tetradus

Answer 6

Normal flora of the female genital tract

Question 7

Finegoldia magna

Answer 7

○ Causes infections with skin and soft tissues, endocarditis, meningitis, pneumonia, breast abscesses and bone infection
○ Small greyish colonies on ANBAP
○ Gram stain shows GPC in clusters
○ Can be confused with Staphylococcus species

Question 8

Cefinase disk test results

Answer 8

○ Pink= positive
○ No color change= negative

Question 8

Cefinase testing

Answer 8

○ βlactamase or cephalosporinase testing
○ Done with a Cefinase disk

Question 9

What species can produce Beta-lactamase?

Answer 9

○ Bacteroides fragilis group
○ Clostridium
○ Fusobacterium