Salmonella enterica serovar Typhi in Japan, 2001-2006: emergence of high-level fluoroquinolone-resistant strains.
The phage types and antimicrobial susceptibilities of 226 isolates of Salmonella enterica serovar Typhi from imported cases in Japan between 2001 and 2006 were investigated. Most (93.8%) had travelled to Asian countries, particularly South East Asia. Twenty-one phage types were identified with E1 (30.5%), UVS (15.9%) and B1 (9.3%) being the most common. The frequency of multidrug-resistant strains reached 37.0% in 2006 with phage types E1 and E9 predominating. Almost half (48.2%) of the isolates were resistant to nalidixic acid and two isolates displayed high-level fluoroquinolone resistance. Three mutations, two in gyrA and one in parC, were identified in both isolates.
Morita
M
M
Department of Bacteriology, National Institute of Infectious Diseases, Shinjuku-ku, Tokyo, Japan.
Hirose
K
K
Takai
N
N
Terajima
J
J
Watanabe
H
H
Sagara
H
H
Kurazono
T
T
Yamaguchi
M
M
Kanazawa
Y
Y
Oyaizu
T
T
Izumiya
H
H
D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D024881:Drug Resistance, Bacterial; D016521:Electrophoresis, Gel, Pulsed-Field; D024841:Fluoroquinolones / Q000494:pharmacology*; D005838:Genotype; D006801:Humans; D008826:Microbial Sensitivity Tests; D012480:Salmonella Infections / Q000453:epidemiology* / Q000382:microbiology*; D012485:Salmonella typhi / Q000187:drug effects*
D000900:Anti-Bacterial Agents; D024841:Fluoroquinolones