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Volume 9, Number 10—October 2003

Research

Cephalosporin-resistant Escherichia coli among Summer Camp Attendees with Salmonellosis

Guillem Prats*Comments to Author , Beatriz Mirelis*, Elisenda Miró*, Ferran Navarro*, Teresa Llovet*, James R. Johnson†, Neus Camps‡, Ángela Domínguez‡, and Lluis Salleras‡
Author affiliations: *Universitat Autònoma, Barcelona, Spain; †University of Minnesota, Minneapolis, Minnesota, USA; ‡Dept. de Sanitat i Seguretat Social, Barcelona, Spain

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Table

Characteristics of 15 extended-spectrum cephalosporin-resistant fecal Escherichia coli isolates derived from an outbreak of salmonellosis

Patient no. (age in y) Schoolb Isolate Isolation date Biotype Serotype PFGE pattern (clone) Plasmid profile Southern blot pattern
β-lactamase Associated resistanced
PstI SmaI /
HincIIc
P5a (12)
EP
1
06-18-01
5671
NT
A
I ae
1
a
CTX-M-9
Tp, Sxt
P6a (11)
EP
1
06-18-01
5671
NT
A
I be
2
b
CTX-M-9
Tp, Sxt
P9a (12)
SB
1
06-19-01
5671
NT
A
I ce
2
b
CTX-M-9
Tp, Sxt
P10a (12)
SB
1
06-19-01
5671
NT
A
I ae
3
c
CTX-M-9
Tp, Sxt

2
06-19-01
7775
O:86
B
II ae
4
d
CMY-2
Tp, Sxt, Cm, Fur
P12a (11)
SB
1
06-19-01
5671
NT
A
I be
3
b
CTX-M-9
Tp, Sxt

2
07-06-01
5671
NT
A
I be
3
b
CTX-M-9
Tp, Sxt
P14a (12)
SB
1
06-19-01
1571
O:20
C
III
3
e
CTX-M-9 + TEM-1
Tp, Sxt, Km, Neo
P15 (11)
SB
1
06-19-01
0371
O:145
D
IV
3
f
CTX-M-9 + TEM-1
Tp, Sxt, Cm
P18a (11)
SB
1
06-19-01
5671
NT
A
I be
3
b
CTX-M-9
Tp, Sxt

2
06-19-01
7775
O:86
B
II be
4
d
CMY-2
Cm, Fur
P19a (12)
T
1
06-19-01
5671
NT
A
I be
3
b
CTX-M-9
Tp, Sxt
F2

1
06-22-01
1571
O:20
C
V
4
ndf
CTX-M-9 + TEM-1
Tp, Sxt, Km, Neo
F3
1
06-22-01
4571
O:55
E
VI
4
d
CMY-2 + TEM-1
Cm, Gm, Km, Neo, Tob
2 06-28-01 4571 O:55 E VI 4 d CMY-2 + TEM-1 Cm, Gm, Km, Neo, Tob

aSalmonella enterica also was isolated.
bSB, Sant Boi; T, Tarragona; EP, El Prat.
cThe SmaI RFLP pattern was determined for those strains carrying the CTX-M-9 enzyme and the HincII RFLP pattern was determined for those carrying the CMY-2 enzyme.
dAll ESCREC isolates were resistant to all penicillins and cephalosporins, including ESCs, as well as to nalidixic acid, tetracycline, sulfonamides and streptomycin. Other antibiotics tested included ampicillin, amoxicillin-clavulanate, piperacillin, cefazolin, cefuroxime, cefoxitin, cefotaxime, ceftazidime, cefepime, aztreonam, imipenem, chloramphenicol (Cm), gentamicin (Gm), kanamycin (Km), tobramycin (Tob), amikacin, neomycin (Neo), sulfamethoxazole-trimethoprim (Sxt), trimethoprim (Tp), ciprofloxacin, fosfomycin, nitrofurantoin, rifampin and furazolidone (Fur).
eThe only difference between the Ia, Ib, and Ic, or the IIa and IIb plasmid profiles is one band higher than 100 kb within the particular plasmid pattern.
fnd, not determined.

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