Serratia marcescens coverage with Bactrim

• recognized as an important opportunistic pathogen combining a propensity for healthcare-associated infection and antimicrobial resistance.
• Most S. marcescens strains are resistant to several antibiotics because of the presence of R-factors, 
• all are considered intrinsically resistant to ampicillin, macrolides, and first-generation cephalosporins (such as cephalexin)
• Choice can be based on antibiotic sensitivity and as guide below:

references:

1. http://www.antimicrobe.org/b26.asp#t6