We took a random selection of 162 bacteria samples from chicken that tested positive for campylobacter and 80 that tested positive for salmonella and determined how many samples resisted antibiotics that are usually effective against those pathogens. Resistant indicates the percentage of samples in which bacteria beat the antibiotic. You might end up taking a drug for longer or trying several before finding one that clears the infection. Differences among brands couldn’t be evaluated because the sample size was small. Each color represents a class of antibiotics. Within classes, drugs are in alphabetical order.

Salmonella Resistant Kanamycin 19% Streptomycin 38 Amoxicillin/clavulanic acid 30 Ampicillin 30 Cefoxitin 35 Ceftiofur 31 Ceftriaxone 0 Nalidixic acid 3 Sulfisoxazole 28 Tetracycline 70 One or more drugs 84

Campylobacter Resistant Azithromycin 7% Erythromycin 7 Telithromycin 4 Clindamycin 3 Ciprofloxacin 20 Nalidixic acid 19 Tetracycline 57 One or more drugs 67

 31 percent of samples were somewhat resistant: The antibiotic inhibited bacterial growth but did not stop it.

Among more-effective drugs on salmonella (0 or 1 percent bacteria samples were resistant): amikacin, gentamicin. chloramphenicol, ciprofloxacin, trimethoprim/sulfamethoxazole.
Among more-effective drugs on campylobacter: gentamicin, florfenicol.