Four Salmonella enterica serovar Virchow strains resistant to broad-spectru
m cephalosporins were isolated from patients with gastroenteritis in 1997 a
nd 1998 in Murcia and Barcelona, Spain, The isolates expressed a beta -lact
amase with a pI of about 8 and a positive PCR when specific primers for CTS
-M-9 were used, These results suggest the presence of a CTX-M-9 beta -lacta
mase in these strains.