ID (y1/y2) Flashcards
Which 3 common staphylococci species are coagulase +?
S. aureus S. pseudintermedius S. hyicus
Which pathogen is often the underlying cause of pyoderma?
s. pseudintermedius
Which pathogen is often the underlying cause of greasy pig disease?
s. hyicus
Which pathogens are often the underlying cause of bumblefoot?
S. gallinarum/Aureus
What is the underlying pathogen for caseous lymphadenitis?
Corynebacterium pseudotuberculosis
What are the 3 major types of staph infection?
superficial infection toxinoses systemic infection
What are the two mechanisms of horizontal gene transfer in bacteria?
Conjugation (plasmid). Bacteriophage
What are the 6 “S’s” of staphylococcal pathogenesis?
Swim Stick Scavenge Spread Survive Scatter
What is the role of adhesins in osteomyelitis/septic arthritis?
Adhesins allow staph to attach to collagen
Which surface protein aids staph in causing endocarditis?
Clumping Factor
Which surface protein of staphs binds to IgG?
Protein A
What are the 4 mechanisms staph uses to prevent phagocytosis?
Chemotaxis Inhibition Protein Fibrogen-Binding protein (complement c3) Staph Complement Inhibitor (stop complement activation) Staphylokinase (cleaves off bound Ig/C3)
What feature of staphs makes them potent mastitis potentiators?
Capsular Polysaccharides (prevents phagocytosis)
What are the 4 general toxin types produced by staphs?
TSS-1 Enterotoxin Exfoliative toxins Cytolytic toxins
What do the alpha and beta toxins of staphs damage?
Membranes !! esp RBCs
Which staph toxins are responsible for necrotising pneumonia?
Leukocidins
Which gene in MRSA confers resistance?
mecA
How do beta lactam drugs work?
Inhibit penicillin binding proteins and disrupt cell wall
How do we diagnose MRSP/A?
Culture Methicillin-resistant? Coagulase test + genetic testing?
Are mycobacteria Aerobes or Anaerobes?
Aerobes
Describe mycobacterial morphology
Rod Shaped (Bacilli)
Describe staining fo mycobacteria.
Gram + OR Gram - but Acid Fast!
Where does TB replicate?
Host Macrophages
What are the clinical signs of advanced bTB?
cough & intermittent pyrexia