Commonly Encountered Coagulase-Negative Staphylococci **Summary:** - **Staphylococcus epidermidis**: - Most common coagulase-negative species. - Susceptible to novobiocin. - **Staphylococcus saprophyticus**: - Primarily associated with urinary tract infections (UTIs). - Resistant to novobiocin. - **Staphylococcus lugdunensis**: - A frequent cause of endocarditis. - Ferments mannitol, PYR positive, and exhibits clumping in plasma (slide coagulase) due to the presence of clumping factor. These coa