Gentamicin

Predictable Activity

Campylobacter spp
Enterobacterales (except Morganella morganii)
Haemophilus influenzae
Haemophilus parainfluenzae
Pasteurella spp
Pseudomonas aeruginosa

Unpredictable Activity

Acinetobacter spp
Aerobic Gram negative bacilli - nonfermenters
Morganella morganii
Staphylococcus spp
Pseudomonas spp (other than P. aeruginosa)

No/Insufficient Activity

Actinomyces spp
Alcaligenes spp
Anaerobes (Gram positive and Gram negative)
Burkholderia spp
Chlamydia spp
Enterococcus spp
Legionella spp
Mycobacterium spp
Mycoplasma spp
Nocardia spp
Salmonella spp
Shigella spp
Stenotrophomonas maltophilia
Streptococcus spp