The antimicrobial resistance of 809 Salmonella Typhimurium isolates collected from humans in
Norway between 1975 and 1998 was studied. The material was subdivided into domestic and
foreign isolates according to whether the patient had recently travelled abroad or not. In
imported isolates the largest increase in resistance was in 1996 when 35% of the isolates were
multi-resistant. The first multi-resistant isolate acquired in Norway appeared in 1994, but
already in 1998 23% of the isolates domestically acquired were multi-resistant, and a majority
were S. Typhimurium DT104. We found no ciprofloxacin resistance in domestically acquired
isolates. Amplified fragment length polymorphism analysis was performed on selected multi-resistant
isolates. The method discriminated well between different multi-resistant isolates, but
not between DT104 isolates. Resistant and multi-resistant S. Typhimurium were until 1998
essentially recovered from patients who had travelled abroad, but multi-resistant isolates,
mainly DT104, are now also being transmitted within the country.
Corrigendum: Antibiotic Resistance in Salmonella Typhimurium Isolates Recovered From the Food Chain Through National Antimicrobial Resistance Monitoring System Between 1996 and 2016