Cocos Gram positivos
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Cocos Gram positivos. Escarlatina: lengua aframbuesada. Cocos. (microscopio electrónico). Cocos. Microcopía electrónica. Streptococcus. Streptococcus pneumoniae en Gram de expectoración. Cocos. Microscopía electrónica. Cocos Gram positivos en frotis de expectoración.

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Streptococcus pneumoniae en Gram de expectoración









MICs cortas.

Oxacillin Susceptible

Oxacillin Intermediate

Oxacillin Resistant

S. aureus

<2 g/ml

no intermediate MIC

>4 g/ml

CoNS

<0.25 g/ml

no intermediate MIC

>0.5 g/ml

Zone sizes

Oxacillin Susceptible

Oxacillin Intermediate

Oxacillin Resistant

S. aureus

>13 mm

11-12 mm

<10 mm

CoNS

>18 mm

no intermediate zone

<17 mm

Puntos de corte (breakpoints) de MIC y disco-difusión para oxacilina frente a S. aureus y

frente a Staphylococcus coagulasa negativos (CoNS)


How is the cortas.mecA gene involved in the mechanism of resistance?Staphylococcal resistance to oxacillin/methicillin occurs when an isolate carries an altered penicillin-binding protein, PBP2a, which is encoded by the mecAgene. The alteration of the penicillin-binding protein does not allow the drug to bind well to the bacterial cell, causing resistance to -lactam antimicrobial agents.


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