Within a 3-day period at a large hospital, five patients undergoing hemodialysis developed fever and chills. Pseudomonas aeruginosa and Klebsiella pnuemoniae were isolated from three of the patients. P. aeruginosa, K. pneumoniae, and Enterobacter agglomerans were isolated from the dialysis system. Why do all three bacteria cause similar symptoms?
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Within a 3-day period at a large hospital, five patients undergoing hemodialysis developed fever and chills. Pseudomonas aeruginosa and Klebsiella pnuemoniae were isolated from three of the patients. P. aeruginosa, K. pneumoniae, and Enterobacter agglomerans were isolated from the dialysis system. Why do all three bacteria cause similar symptoms?
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- Which of the following is true regarding pathogenic strains of Staphylococcus and Streptococcus, respectively? A) O Staphylococcus aureus is a common cause of sore throats. B) O Alpha-hemolytic Streptococci turn blood agar green and include members that cause pneumonia and tooth decay, C) Gamma-hemolytic Streptococci completely lyse red blood cells on blood agar. D) O The beta-hemolytic group of Streptococci does not contain any pathogenic types.clostridium botulinum is a bacterium usually present in soil that may cause botulism. Briefly explain why one or few cells of a pathogenic bacterium, such as clostridium botulism, by itself typically does not secrete a toxin, despite the species as a whole being characterized as toxin producing.A 65-year-old woman has a long-term central venous catheter for intravenous therapy. She develops fever and subsequently has multiple blood cultures positive for Staphylococcus epidermidis. All of the S. epidermidis isolates have the same colony morphology and antimicrobial susceptibility pattern, suggesting that they are the same strain. In what possible way do you think she has contracted the bacteria? Which link in the chain of infection has broken in this particular scenario and what will be your advice to avoid such infections?
- This bacterium is a Gram-negative diplococci that possesses a capsule; finding these cells in cerebrospinal fluid (CSF) is a preliminary diagnosis for the deadly disease it causes. What is bacterium? A) O Streptococcus pneumoniae B) O Neisseria meningitidis C) O Cryptosporidium parvum D) O Clostridium tetani E) O Staphylococcus aureussix Staphylococcus aureus are inoculated into a cream pie by the hands of a pastry chef. The generation time of S. aureus in cream pie at room temperature is 30 minutes. a) How many S. aureus are in the pie after 4 hours at RT? b) After 24 hours?When hydrogen peroxide is placed on a colony of an unknown bacterium, bubbles form. Based on this information, you can conclude that the bacteriuma) is Staphylococcus epidermidis.b) is a lactic acid bacterium.c) is beta-hemolytic.d) is catalase-positive.e) can cause strep throat.
- Not only is blood agar an enriched medium that can support fastidious organism growth, but it can also serve as a differential medium in the identification of streptococcal species because of the presence of red blood cells that can be destroyed by an organism's hemolysins. Looking at this photo, how could you describe the organism growing on the surface of this blood agar plate? Multiple Choice a) Gamma-hemolytic b) Alpha-hemolytic c) Non-hemolytic d) Beta-hemolyticWhy is aseptic urine collection important when cultures are ordered? If you counted 20 colonies from a 0.01-ml inoculum of a 1:10 dilution of urine, how many organisms per milliliter of specimen would you report? Is this number significant? What can you learn from visual inspection of a urine specimen? How would you relate these to the microorganisms present in the sample? How are UTIs acquired/transmitted? Explain why E. coli is frequently implicated in cystitis in females.Which of the following bacterial species is considered normal flora of the mouth? O 1) Streptococcus mutans 2) Escherichia coli 3) Klebsiella pneumoniae 4) Staphylococcus epidermidis