Bacteriology Flashcards
Which bacteria are beta-hemolytic?
agh
Nocardia produce which gas?
On triple sugar media H2S.
Which bacteria produces H2S?
Erythripolocsis rhuisiopathe
Which bacteria have gelatinase?
Enterococci, Ba
Urease positive
Corynebacterium urealyticum, Corynebacterium ulcerans, Corynebacterium pseudotuberculiosis, Nocardia
Which bacteria are especially dangerous during pregancy?
Listeria monocytogenes, Strectociccus pyogenes, S. agalactiae
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ლუნდუნენსი და აურეუსი
What type of organisms stain purple/blue with Gram staining?
Gram-positive organisms
Gram-positive organisms are commonly classified into which two shapes?
Cocci or rods (bacilli)
Name four gram-positive rods.
Clostridium, Listeria, Bacillus, and Corynebacterium
Name one gram-positive anaerobic rod.
Clostridium
Staphylococcus and Streptococcus are differentiated by which enzyme?
Catalase; Staphylococcus is catalase positive, and Streptococcus is catalase negative
Which gram-positive cocci are found in clusters?
Staphylococcus
Which gram-positive cocci are found in chains?
Streptococcus
What differentiates Staphylococcus aureus from and other staph species?
Other staph species are coagulase negative
Name two coagulase-negative Staphylococcus species.
Staphylococcus saprophyticus and Staphylococcus epidermidis
Which Staphylococcus species is novobiocin sensitive?
Staphylococcus epidermidis
Which Staphylococcus species is novobiocin resistant?
Staphylococcus saprophyticus
If agar shows clear hemolysis, which Streptococcus species could be present?
Streptococcus pyogenes or Streptococcus agalactiae
What type of hemolysis do both group A and group B streptococci have in common?
β-Hemolysis
Streptococcus pyogenes is a type of group _____ Streptococcus, whereas Streptococcus agalactiae is a type of group _____ Streptococcus.
A, B
How are -hemolytic streptococci differentiated from each other?
By their bacitracin sensitivity (Streptococcus pyogenes is sensitive, Streptococcus agalactiae is resistant)
Name two streptococci that are -hemolytic.
Enterococcus and Peptostreptococcus (anaerobic)
True or False: Enterococcus faecalis is a -hemolytic, gram-positive, catalase-negative cocci.
True
Which -hemolytic streptococcal species is bacitracin resistant?
Group B Streptococcus (Streptococcus agalactiae)
Which -hemolytic streptococcal species is bacitracin sensitive?
Group A Streptococcus (Streptococcus pyogenes)
Staphylococcus saprophyticus is novobiocin _____ (resistant, sensitive); staphylococcus epidermidis is novobiocin _____ (resistant, sensitive).
Resistant; sensitive (remember: On the staph retreat there was NO StRES; Novobiocin: Saprophyticus Resistant, Epidermidis Sensitive)
Group A streptococci are bacitracin _____ (resistant, sensitive); group B streptococci are bacitracin _____ (resistant, sensitive).
Sensitive; resistant (remember: Bacitracin: group B are Resistant, whereas group A are Sensitive (B-BRAS)
Streptococcus viridans is optochin _____ (resistant, sensitive); streptococcus pneumoniae is optochin _____ (resistant, sensitive).
Resistant; sensitive (remember, Optochin: Viridans Resistant and Pneumonia Sensitive; OVRPS- overpass)
What bacterial enzyme degrades hydrogen peroxide?
Catalase
What antimicrobial product produced by polymorphonuclear lymphocytes is a substrate for myeloperoxidase?
Hydrogen peroxide
Which gram-positive cocci are catalase positive?
Staphylococci
What differentiates Staphylococcus aureus from Staphylococcus epidermidis and Staphylococcus saprophyticus?
Coagulase (Staphylococcus aureus is coagulase positive)