Flashcards in microbiology ch 11( streptococci, staphylococci, and micrococci Deck (17)
Name the 3 different ways streptococci causes haemolysis
alpha- partial haemolysis with green color
beta- wide clear zone of complete lysis
gamma- no lysis
Name the 4 groups of streptococci
A- streptococcus pyogenes, human disease
B- streptococcus agalactiae ( female genital tract)
D- Enterococci, human disease
Nasopharynx & skin, Beta haemolysis, causes tonsillitis, pharyngitis, peritonsillar abcess, scarlet fever etc...
what toxins does strep pyogense have?
streptokinase- lyses fibrin
Hyaluronidase- attacks material which binds connective tissue thus causing increased permeability ( spreading factor
DNAases- destroy DNA
Haemolysins- erythematous rash in scarlet fever.
human vagina and passed to kid during nursing, Causes neonatal meningitis and sepsis, beta haemolytic
in oropharynx, mostly alpha but beta and gamma are present,.
oral streptococci role in dentistry
Secrete sticky polysacharide which allows binding to enamel. Can cause infective endocarditis after dental procedure
Name the 4 groups of oral streptococci
mutans, salivarius, anginosus, mitis
upper respiratory tract, causes pneumonia, & meningitis and otitis media in children, gram positive lancet- shaped cocci ( diplococcic), alpha haemolytic
high in adults ove 70., grapelike clusters, includes aureus and epidermidis and saprophyticus, causes absesses of organs, endocarditis, gastroenteritis and toxic shock syndrome
skin, anterior nares, perineum, transmitted via hands, catalase positive, positive for protein A-latex agglutination test
how can you tell aures and epidermis apart?
aureus coagulates blood, epidermis doesnt
toxins of staph aureus
coagulase- clots plasma
some staph aureus have a beta lactamase plasmid. What does this do ?
provides resistants to penicillin
skin, coagulase negative, resistant to penicillin and methicillin, sensative to vancomyocin
UTI's in woman, infections with intercourse, Can be differentiated by using the mannitol fermentation reaction test.