Gram-positive organisms Enterococcus faecalis
Ampicillin, vancomycin/teicoplanin
Enterococcus faecium
Vancomycin/teicoplanin, linezolid
Glycopeptide-resistant enterococci
Linezolid, tigecycline, daptomycin
MRSA
Clindamycin, vancomycin, rifampicin (never used as monotherapy), linezolid, daptomycin, tetracyclines, tigecycline, co-trimoxazole
Staphylococcus aureus
Flucloxacillin, clindamycin
Streptococcus pyogenes
Penicillin, clindamycin, vancomycin
Streptococcus pneumoniae
Penicillin, cephalosporins, levofloxacin, vancomycin
Gram-negative organisms Escherichia coli, coliforms (enteric Gram-negative bacilli)
Amoxicillin, Trimethoprim, cefuroxime, Ciprofloxacin, Co-Amoxiclav
Enterobacter spp., Citrobacter spp.
Ciprofloxacin, meropenem, ertapenem, aminoglycosides
ESBL-producing Enterobacteriaceae
Ciprofloxacin, meropenem, ertapenem (if sensitive), temocillin, aminoglycosides
Carbapenemase-producing Enterobacteriaceae
Ciprofloxacin, aminoglycosides, tigecycline, colistin
Haemophilus influenzae
Amoxicillin, Co-Amoxiclav, macrolides, cefuroxime, cefotaxime, Ciprofloxacin
Legionella pneumophila
Azithromycin, levofloxacin, doxycycline
Neisseria gonorrhoeae
Ceftriaxone/cefixime, spectinomycin
Neisseria meningitidis
Penicillin, cefotaxime/ceftriaxone, chloramphenicol
Pseudomonas aeruginosa
Ciprofloxacin, piperacillin-tazobactam, aztreonam, meropenem, aminoglycosides, ceftazidime/cefepime
Salmonella typhi
Ceftriaxone, azithromycin (uncomplicated typhoid), chloramphenicol (resistance common)
Strict anaerobes Bacteroides spp.
Metronidazole, clindamycin, Co-Amoxiclav, piperacillin-tazobactam, meropenem
Clostridioides difficile
Metronidazole, vancomycin (oral), fidaxomicin
Clostridium spp.
Penicillin, Metronidazole, clindamycin
Fusobacterium spp.
Penicillin, Metronidazole, clindamycin
Other organisms Chlamydia trachomatis
Azithromycin, doxycycline
Treponema pallidum
Penicillin, doxycycline
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