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•Campylobacterisolates from chicken meat were more resistant than those from humans.•Multidrug resistance was observed in 96.3% of C. coliisolates from chicken meat.•Macrolide resistance was observed in 85.5% of C. coliisolates.•Erm(B) was the primary contributor to macrolide resistance.•Campylobacteriosis outbreaks may occur more frequently in Taiwan than assumed.

•S. Typhimurium clones can be compared among laboratories.•Each clone displayed unique antimicrobial resistance profiles.•Multidrug-resistant S. Typhimurium clones fluctuated in Taiwan over 16 years.•Several plasmid types were the primary vehicles for mph(A), blaCMY-2, and blaDHA-1.•The multiple resistance in S. Typhimurium threatens medical therapy.

•A nosocomial salmonellosis outbreak caused by blaOXA-48-carrying, extensively drug-resistant (XDR) SalmonellaGoldcoast.•The OXA-48–producing XDR strains are susceptible to ceftazidime/avibactam.•The deficiency of an MFS protein could link to elevated MICs to β-lactams.