![]() ![]() ![]() The morphology of the organism may be classified as cocci, diplococci, bacilli (also known as "rods"), spiral-shaped or pleomorphic. Although bacteria are biologically classified using taxonomy, disease-causing bacteria have historically been classified by their microscopic appearance and chemical function. Bacterial targets Īntibiotics are often grouped by their ability to act on different bacterial groups. An example of a commonly used broad-spectrum antibiotic is ampicillin. Although powerful, broad-spectrum antibiotics pose specific risks, particularly the disruption of native, normal bacteria and the development of antimicrobial resistance. This is in contrast to a narrow-spectrum antibiotic, which is effective against only a specific group of bacteria. These medications are used when a bacterial infection is suspected but the group of bacteria is unknown (also called empiric therapy) or when infection with multiple groups of bacteria is suspected. A colored electron microscopy image of methicillin-resistant staphylococcus aureus ( MRSA), a bacterium commonly targeted by broad-spectrum antibioticsĪ broad- spectrum antibiotic is an antibiotic that acts on the two major bacterial groups, Gram-positive and Gram-negative, or any antibiotic that acts against a wide range of disease-causing bacteria. ![]()
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