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...the second and first generation cephalosporins, itis more active against [[Gram stain|gram-negative]] bacteria and less active against gram-positive bacteria. Ce

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...is a third-generation [[cephalosporin]] with excellent activity against [[Gram stain|Gram-negative organisms]]. Its uses include "serious bone and joint infecti

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...n of urethral secretions demonstrating >5 WBC per oil immersion field. The Gram stain is the preferred rapid diagnostic test for evaluating urethritis. It is hig ...al and gonococcal infection in men without polymorphonuclear leukocytes on Gram stain: implications for diagnostic approach and management |journal=Sex Transm Di

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...he antibiotic molecule. The modifications variously improve coverage of [[Gram stain|Gram-negative]] organisms, beta-lactamase resistance, or both. Another app

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'''''Escherichia coli''''' (commonly known as ''E. coli''), is a [[Gram stain|Gram-negative]] flagellated rod-shaped bacterium. It is facultatively anaer

...''' is a genus of facultatively anaerobic, [[oxidase|oxidase-positive]], [[Gram stain|Gram-negative]] bacteria. They are flagellated and in the shape of curved r

The thick cell wall of [[Gram stain|Gram-positive bacteria]] protects them from MAC-based lysis. Other bacteria

...for which antibiotics should be administered promptly, either based on a [[Gram stain]] of cerebrospinal fluid or using empiric criteria.<ref name=eMed-Treat>{{c

A Gram stain of the fluid can guide initial antibiotic therapy.

...tive and [[oxidase-negative]] characteristics of ''Enterobacteriaceae'', [[Gram stain]]s and [[oxidase test]]s are performed. Candidae organisms are Gram and ox

''''' Bifidobacterium animalis''''' is a [[Gram stain|Gram-positive]], anaerobic, nonsporeforming [[bacillus]]. It is occasionall

| width=50%|[[Gram stain]]

...ains to detect and identify bacteria, with his work being the basis of the Gram stain and the Ziehl-Neelsen stain. ...ram negative) based on differences in cell wall structure as revealed by [[Gram stain]]ing. Gram positive bacteria possess a cell wall containing a thick [[pepti

...the ''C. tetani'''s cell wall allows it to retain the violet crystals in a Gram stain. The resulting appearance under a microscope is often described as resembli