22-year-old woman consulted her physician because of a postpartum breastinfection. A Gram stain of the pus revealed gram-positive bacteria and a susceptibilitytest showed resistance to all β-lactam antibiotics.1. Which of the following bacteria was most likely the o ending pathogen?A. Methicillin-resistant Staphylococcus aureusB. Escherichia coliC. Streptococcus pyogenesD. Enterococcus faecalis
Question
22-year-old woman consulted her physician because of a postpartum breastinfection. A Gram stain of the pus revealed gram-positive bacteria and a susceptibilitytest showed resistance to all β-lactam antibiotics.1. Which of the following bacteria was most likely the o ending pathogen?A. Methicillin-resistant Staphylococcus aureusB. Escherichia coliC. Streptococcus pyogenesD. Enterococcus faecalis
Solution
The most likely offending pathogen in this case is A. Methicillin-resistant Staphylococcus aureus (MRSA).
Here's why:
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The Gram stain of the pus revealed gram-positive bacteria. Both Staphylococcus aureus and Streptococcus pyogenes are gram-positive, while Escherichia coli is gram-negative and thus can be ruled out.
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The susceptibility test showed resistance to all β-lactam antibiotics. Methicillin-resistant Staphylococcus aureus (MRSA) is known to be resistant to all β-lactam antibiotics, including methicillin, penicillin, and amoxicillin.
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The patient's condition, a postpartum breast infection, is also known as postpartum mastitis, which is most commonly caused by Staphylococcus aureus.
Therefore, considering the gram stain result, antibiotic resistance, and the patient's condition, the most likely pathogen is Methicillin-resistant Staphylococcus aureus (MRSA).
Similar Questions
. Staphylococcus aureus é a mais perigosa de todas as bactérias estafilocócicas mais comuns. Essas bactérias gram-positivas têm forma de esferas (cocos) e frequentemente causam infecções cutâneas, mas também podem causar pneumonia, infecções da válvula cardíaca e infecções ósseas, além de um tipo de doença transmitida por alimentos. (BUSH, 2017)Dentre as opções apresentadas a seguir, marque a que apresenta características sobre infecções causadas por Staphylococcus aureus.A. A gastroenterite estafilocócica resulta da ingestão de esporos de Staphylococcus aureus, de sua colonização no intestino grosso e da produção de toxinas in vivo;B. Toxinfecção alimentar é um tipo de Doença Transmitida por Alimentos (DTA) adquirida por meio da ingestão de alimentos contaminados por micro-organismos patogênicos que produzirão toxinas no trato gastrointestinal;C. As intoxicações alimentares ocorrem quando uma pessoa ingere alimentos com substâncias tóxicas, incluindo as toxinas produzidas por micro-organismos, como bactérias e fungos.
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