USMLE Forum Archives - USMLE Step 1 - organism responsible
organism responsible
bingousmle - 04-19-10 12:18
You are evaluating a 21-year-old woman with an erythematous, tender, and edematous hand. She reports that while playing with her cat 3 days ago, he bit her and punctured the skin. The area around the bite is
inflamed, and there is a purulent discharge from the puncture site. What is
the most likely infecting organism?
a. Clostridium perfringens
b. Staphylococcus aureus
c. Streptococcus pyogenes
d. Pasteurella multocida
e. Haemophilus influenzae
bingousmle - 04-19-10 12:18
You are evaluating a 21-year-old woman with an erythematous, tender, and edematous hand. She reports that while playing with her cat 3 days ago, he bit her and punctured the skin. The area around the bite is
inflamed, and there is a purulent discharge from the puncture site. What is
the most likely infecting organism?
a. Clostridium perfringens
b. Staphylococcus aureus
c. Streptococcus pyogenes
d. Pasteurella multocida
e. Haemophilus influenzae
The correct answer and explanation will be available after you answer.
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#6
Re: organism responsible babbu5508 - 04-23-10 02:38 My answer is: d.
P. multocida is the most common cause of infection from animal injuries (pneumonia in cattle and pigs, atrophic rhinitis in pigs and goats, and wound infections after dog/cat-bites.) A high leukocyte and neutrophil count is typically observed, leading to an inflammatory reaction at the infection site (generally a diffuse localized cellulitis). It can also infect other locales, such as the respiratory tract. In more serious cases, a bacteremia can result, causing an osteomyelitis or endocarditis. The bacteria may also cross the blood-brain barrier and cause meningitis.
#9
Re: organism responsible mtniharika - 05-18-10 01:56 My answer is: d.
Pasteurella multocida is a Gram-negative, non-motile coccobacillus that is penicillin-sensitive. It can cause a zoonotic infection in humans, which typically is a result of bites or scratches from domestic pet.
#10
Re: organism responsible
bingousmle - 05-18-10 02:00 Pasteurella multocida is a Gram-negative, non-motile coccobacillus that is penicillin-sensitive. It can cause a zoonotic infection in humans, which typically is a result of bites or scratches from domestic pet.
true...
#11
Re: organism responsible mtniharika - 05-18-10 03:50 .) A high leukocyte and neutrophil count is typically observed, leading to an inflammatory reaction at the infection site (generally a diffuse localized cellulitis).It can also infect other locales, such as the respiratory tract. In more serious cases, a bacteremia can result, causing an osteomyelitis or endocarditis.
#22
Re: organism responsible galaxy - 05-26-10 02:53 My answer is: d.
This bacterium can be effectively treated with beta-lactam antibiotics, which inhibit cell wall synthesis. It can also be treated with fluoroquinolones or tetracyclines
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