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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Cocos Gram positivos

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Cocos gram positivos

Cocos Gram positivos


Cocos gram positivos

Escarlatina: lengua aframbuesada


Cocos gram positivos

Cocos. (microscopio electrónico)


Cocos gram positivos

Cocos. Microcopía electrónica


Cocos gram positivos

Streptococcus


Cocos gram positivos

Streptococcus pneumoniae en Gram de expectoración


Cocos gram positivos

Cocos. Microscopía electrónica


Cocos gram positivos

Cocos Gram positivos en frotis de expectoración


Cocos gram positivos

Cocos Gram positivos en cadenas


Cocos gram positivos

Neumococo en frotis de expectoración. Diplos y cadenas cortas.


Cocos gram positivos

Escarlatina. Exantema rugoso.


Cocos gram positivos

Reacción exfoliativa luego de infección estreptocóccica


Cocos gram positivos

Escarlatina. Eritema rugoso


Cocos gram positivos

MICs

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)


Cocos gram positivos

How is the 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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