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In page Cephalosporin:

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Cephalosporins can be indicated for the prophylaxis and treatment of infections caused by bacteria susceptible to this particular form of antibiotic. First-generation cephalosporins are active predominantly against Gram-positive bacteria, such as Staphylococcus and Streptococcus.[1] They are therefore used mostly for skin and soft tissue infections and the prevention of hospital-acquired surgical infections.[2] Successive generations of cephalosporins have increased activity against Gram-negative bacteria, albeit often with reduced activity against Gram-positive organisms.[citation needed]