Diffusion and Persistence of Multidrug Resistant Salmonella Typhimurium Strains Phage Type DT120 in Southern Italy
Table 2
Antimicrobial susceptibility, phage types, pulsotypes, PCR detection of SGI1, class 1 integrons, and resistance genes in S. Typhimurium strains isolated in Southern Italy in 2006–2008.
PulseNet Europe nomenclature
Phage type (no. of strains)
Year (no. of strains)
Resistance patterna
Class 1 integrons
SGI1
intI1
Gene cassette(s)
Resistance gene(s)
Left junction
Right junction
STYMXB.0061
DT120 (31)
2006 (9); 2007 (13); 2008 (9)
ACSSuT
+
aadA2; bla
PSE-1
floR; sul1; tet(G)
+
+
U302 (7)
2006 (1); 2008 (4) 2008 (2)
′′
+
′′
′′
+
+
′′
+
′′
′′
+
−
RDNC (1)
2006 (1)
′′
+
′′
′′
+
+
STYMXB.0113
ST193 (3)
2006
ASuTTp
−
−
bla
TEM; sul2; tet(A); dfrA12
−
−
DT35 (2)b
′′
′′
−
−
bla
TEM; sul2; tet(A)
−
−
STYMXB.0140
DT120 (4)
2007 (4)
ACSSuT
+
bla
OXA-30-aadA1
catA1; sul1; tet(B)
−
−
Unnamed 1
DT120 (9)
2006 (2); 2007 (3)
ACSSuT
+
aadA2;blaPSE-1
floR; sul1; tet(G)
+
+
Unnamed 2
′′
2008 (2)
′′
+
′′
′′
+
+
Unnamed 3
′′
2008 (2)
′′
+
bla
OXA-30-aadA1
catA1; sul1; tet(B)
−
−
Unnamed 4
′′
2007 (2)
ACSSuTTp
+
aadA2; bla
PSE-1 dfrA1-aadA1
floR; sul1; tet(G)
+
+
Unnamed 5
DT7varc
2007 (1)
AKSSuT
−
−
bla
TEM; sul2; strAB; tet(B)
−
−
Unnamed 6
DT1
2008 (1)
ASSuT
−
−
bla
TEM; sul2; strAB; tet(A)
−
−
Unnamed 7
U302d
2008 (1)
ASSuTp
−
−
bla
TEM; sul2; dfrA12
−
−
A, ampicillin; C, chloramphenicol; K, kanamycin; S streptomycin; Su, sulfamethoxazole; T, tetracycline; and Tp, trimethoprim.
bThe resistance to Tp was not identified.
cThe resistance to K was not identified.
dThe resistance to S and Tp was not identified. RDNC: the reaction pattern is not conforming to a recognised phage type. Key: +, positive; −, negative.
