Number of resistant Salmonella isolates belonging to different serovars isolated from humans, cattle, pigs and poultry in Vietnam by an agar diffusion method*.

Abbreviations used: N, number of the isolates tested A, ampicillin (10µg); Ac, amoxicillin/clavulanic acid (30/15µg); Ce, cephalothin (30µg); Cf, ceftazidime (30µg); S, streptomycin (10µg); G, gentamicin (10µg); K, kanamycin (30µg); C, chloramphenicol (30µg), Na, nalidixic acid (30µg); No, norfloxacin (10µg); Ci, ciprofloxacin (5µg); T, tetracycline (30µg); Su, sulphonamide (300µg); Tp, trimethoprim (5µg), Co, colistin (10µg); MDR, multidrug-resistant.*The number of isolates resistant to a particular antimicrobial agent is given below each antimicrobial.**The percentage of the total number of isolates resistant, intermediate resistant or susceptible for a particular antimicrobial is indicated in the last three rows below each antimicrobial.