Lec 6 Flashcards
Resides in the skin and mucous membrane of humans and animals
Staphylococcus epidermis
Colonies are smooth, circular and usually pale transparent white
Staphylococcus epidermis
Resistant to novobiocin and nalidixic acid
Staphylococcus saprophyticus
Common cause of UTI
Staphylococcus saprophyticus
Recovered from compromised patients, particularly drug users, as an agent of endocarditis and septicemia
Stomatococcus mucilaginosus
Drug of choice for Stomatococcus mucilaginosus
PCN
No acid in glycerol in the presence of erythromycin
Micrococcus
Selective and differential medium and is commonly used to isolate staphylococci from clinical specimen
Mannitol salt agar
Agent of dog bite infection
S. intermedius
Never been implicated as a human pathogen
S. hyicus
S. aurens pigment
Golden yellow
S. epidermis pigment
white
S. saprophyticus pigment
Lemon yellow
Majority are free living saprophytes
Micrococcus
Planococcus
Inhabits surface of primates and other mammals
Staphylococcus and Stomatococcus
Invade the bloodstream, metastasize and appear in the urine or forming abscess in various body organs or producing septic shock
Staphylococcus aureus
Endopeptidase that cleaves the peptide linkages
Lysostaphin
Grow as large, entire, very glossy, smooth, opaque, butyrous, convex
5% sheep blood agar of Staphylococcus saprophytics
Gram positive cocci in tetrads
Micrococcus
Micrococcus are found in?
- Skin
- Mucosa
- Oropharynx
Young women and in older men who have indwelling catheters
Cystitis
Adhere to inorganic surfaces like catheter
Biofilms
Insertion of artificial valves, prostatic devices, intravascular catheters
Bacterial endocarditis
Can also be found in wounds
Staphylococcus aureus
Furazilodone test is susceptible to?
Staphylococcus
Differentiates micrococcal and staphylococcal species from streptococcal species
Catalase test
Catalase test of Staphylococcus and Micrococcus
(+)
Catalase test of Streptococcus
(-)
Clumping factor
Bound
Extracellular coagulase
Free
Differentiate gram positive, catalase-positive cocci (micrococci from staphylococci)
Microdase test
Detects the enzyme oxidase
Microdase test
Conversion of fibrinogen to fibrin
Coagulases
Toxic to RBCs, WBCs, platelets, and hepatocytes
Alpha toxin
Toxic to WBCs, preventing clearance of the organisms
Gamma toxin
Susceptible to Novobiocin
Staphylococcus epidermis