Bactericidal Versus Bacteriostatic Activity

The term bactericidal refers to drugs that typically kill or destroy bacteria. In contrast, drugs that do not actu- 

Type Gram-positive bacilli Principal Features Generally rod-shaped retain color when treated by Gram s method of staining Common Examples Bacillus anthracis, Clostridium tetani 

Gram-negative bacilli Rod-shaped do not retain color by Gram s method Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa 

Gram-positive cocci Generally spherical or ovoid in shape retain color by Gram s method Staphylococcus aureus, Streptococcus pneumoniae 

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