Which organisms are typically sensitive to Cephalexin?

Cephalexin is a first-generation cephalosporin antibiotic that is primarily effective against a wide range of gram-positive bacteria and some gram-negative bacteria. It works by inhibiting bacterial cell wall synthesis, which is crucial for the survival of bacteria. The organisms that are typically sensitive to Cephalexin include those that are most commonly encountered in clinical infections, such as Streptococcus and Staphylococcus species, as well as some Enterobacteriaceae.

When considering the other options, mycobacteria have a different cell wall composition that makes them resistant to cephalosporins. Viral pathogens are not affected by antibiotics, as they replicate inside host cells and do not have a cell wall to target. Fungi also have distinct cell wall structures composed of chitin, which are not affected by cephalosporins. Therefore, the broad sensitivity of Cephalexin to most bacteria emphasizes its effectiveness and relevance in treating bacterial infections.