30 Questions
What is the most common cause of acute endocarditis in IV drug users?
Native valve (tricuspid valve)
Which of the following is a complication of pneumococcal pneumonia?
Empyema
What is the characteristic feature of Brodie abscess?
Sequestered focus of osteomyelitis in the metaphyseal area
Which of the following is NOT a skin infection caused by Staphylococcus aureus?
Ringworm
What is the name of the syndrome caused by Staphylococcus aureus, characterized by desquamation of the skin?
Scalded Skin Syndrome
What is the name of the food commonly associated with Staphylococcal gastroenteritis?
Mayonnaise
What is the primary source of Staphylococcus aureus toxin that causes acute onset of vomiting and diarrhea?
Salad made with mayonnaise
What is the characteristic skin finding in Scalded Skin Syndrome (Ritter disease)?
Separation of epidermis at stratum granulosum
What is the primary toxin responsible for Toxic Shock Syndrome?
TSST-1
What is the typical scenario associated with Toxic Shock Syndrome?
Tampon-using menstruating women
What is the characteristic oral finding in Toxic Shock Syndrome?
Strawberry tongue
What is the most likely causative agent of the patient's symptoms in the given scenario?
Staphylococcus Aureus
What is the characteristic of Staphylococcus saprophyticus colonies on blood agar?
Whitish
What is the term for the pain in urination experienced by patients with Staphylococcus saprophyticus infection?
Dysuria
What is the most common cause of UTIs in sexually active women, second only to E. coli?
Staphylococcus saprophyticus
What is the antibiotic of choice for treating Staphylococcus saprophyticus infection?
TMP-SMX
What is the term for the presence of bacteria in urine?
Bacteriuria
Why is removal of the prosthetic device necessary in the treatment of Staphylococcus epidermidis infection?
Because it is a device-related infection
What is the DOC for Methicillin-resistant Staphylococcus aureus (MRSA)?
Vancomycin
What is unique about Staphylococcus epidermidis colonies on blood agar?
They are whitish and non-hemolytic
What is the primary habitat of Staphylococcus epidermidis?
Normal skin flora and mucous membranes of humans
What is the role of biofilm formation in Staphylococcus epidermidis?
Colonization, immune evasion, and antibiotic resistance
What is the most common cause of prosthetic valve endocarditis?
Staphylococcus epidermidis
What does a titer of over 250 Todd units indicate?
Recent or repeated infection
What is the function of poly-γ-glutamic acid (PGA) and poly-N-acetylglucosamine (PNAG)/PIA in Staphylococcus epidermidis?
Protect from innate host defense mechanisms
What is the complication of impetigo contagiosa?
Poststreptococcal glomerulonephritis
What is the role of hyaluronidase in skin and soft tissue infections?
It facilitates the spread of infection
What is the most common bacterial cause of sore throat?
Streptococcus pyogenes
What is Fournier's gangrene?
A form of necrotizing fasciitis involving the male genital area and perineum
What is the effect of antistreptokinase on streptokinase?
It decreases the efficiency of streptokinase in managing MI
This quiz covers the various diseases and infections caused by Staphylococcus aureus, including skin infections, pneumonia, osteomyelitis, and toxic shock syndrome. Test your knowledge of the symptoms, causes, and types of diseases associated with this bacterium.
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