Staphylococcus Flashcards
what is a common cause of skin infections in dogs?
Staphylococcus pseudintermedius
what does Staphylococcus look like under a microscope after gram staining?
clusters of gram positive (purple) cocci
grapes
what is pus?
tissue debris
degenerating leukocytes
bacteria
what are some differentials for why a dog has a recurrent bacterial skin infection?
autoimmune condition
bacteria resistant
breed: lots of skin folds?
diabetes can predispose
lack of owner compliance
where are Staphylococcus found?
commensal on skin of humans and animals
skin and mucous membranes:
upper respiratory tract
lower urogenital tract
skin
nares
moist skin folds
what is an enzyme that some Staphylococcal species release that causes the formation of clots?
coagulase
what does it mean for a Staphylococcus species to be coagulase positive?
has coagulase enzyme
are coagulase positive or coagulase negative Staphylococci more pathogenic?
coagulase positive
why do some Staphylococci have coagulase enzyme?
can hide behind clot that it forms: shields from phagocytosis
how does protein A of Staphylococcus hyicus help it evade the immune system?
binds to Fc region of IgG and blocks the ability of the immune system to recognize the bacteria
what does Staphylococcus pseudintermedius infect?
dogs: pyoderma and otitis
who does Staphylococcus aureus infect primarily?
cows: chronic mastitis
who does Staphylococcus hyicus infect?
pigs: exudative epidermitis
are Staphylococci facultative anaerobes, anaerobes, or aerobes?
facultative anaerobes: can live in both aerobic and anaerobic conditions
what is the most common mode of transmission for Staphylococcus infection?
direct contact
