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salmonella enterica serovar virchow with ctx-m-like beta-lactamase in spain.four salmonella enterica serovar virchow strains resistant to broad-spectrum cephalosporins were isolated from patients with gastroenteritis in 1997 and 1998 in murcia and barcelona, spain. the isolates expressed a beta-lactamase with a pi of about 8 and a positive pcr when specific primers for ctx-m-9 were used. these results suggest the presence of a ctx-m-9 beta-lactamase in these strains.200011101623
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