[Characterization and molecular epidemiology of ESBL in Escherichia coli and Klebsiella pneumoniae in 11 Spanish hospitals (2004)].
BACKGROUND
The epidemiological distribution of extended-spectrum beta-lactamase (ESBL) types in Escherichia coli and Klebsiella pneumoniae was evaluated in various hospitals in Spain and compared with previous studies.


METHODS
A total of 11 Spanish hospitals participated in this study. Each center collected the first 15 isolates of E. coli and the first 5 of K. pneumoniae suspected of being ESBL-producers and isolated during the first quarter of 2004. Clonal study was done by PFGE after total DNA digestion with XbaI and by ERIC-PCR (Enterobacterial Repetitive Intergenic Consensus Sequences-Polymerase Chain Reaction), typing. ESBL-producers were characterized by isoelectric focusing (IEF), PCR and sequencing.


RESULTS
A total of 124 strains were collected. PFGE restriction patterns showed considerable diversity among E. coli strains; 4 clusters of 2 strains each were detected. ESBL characterization of 92 E. coli strains showed a predominance of CTX-M-14 (45.7%), CTX-M-9 (20.6%) and SHV-12 (21.7%). Clonal diversity among the 32 K. pneumoniae strains was less pronounced than in E. coli; 3 clusters included 53.1% of strains. The ESBL detected in these strains included a CTX-M type in 20 cases (62.5%) (CTX-M-1, CTX-M-9, CTX-M-14 and CTX-M-15); a SHV type in 11 (34.4%) (SHV-12 and SHV-5) and TEM-4 (3.1%) in 1 case.


CONCLUSIONS
The E. coli and K. pneumoniae strains analyzed in this period displayed a greater diversity of ESBL than has been observed in previous epidemiological studies. Analysis of clonal relationships revealed a greater diversity in E. coli than in K. pneumoniae.
Servicio de Microbiologı´a, Hospital de la Santa Creu i Sant Pau, Departament de Gen etica i Microbiologia,Universitat Autonoma de Barcelona, Bellaterra, Cerdanyola del Valles , Barcelona, Spain.
Karol
K
Diestra
Teresa M
TM
Coque
Elisenda
E
Miró
Jesús
J
Oteo
Carlos Juan
CJ
Nicolau
José
J
Campos
Bartolomé
B
Moyá
Tânia
T
Curiao
María
M
Pérez-Vázquez
Rafael
R
Cantón
Antonio
A
Oliver
Ferran
F
Navarro
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D017714:Community-Acquired Infections / Q000201:enzymology / Q000453:epidemiology / Q000382:microbiology; D003428:Cross Infection / Q000453:epidemiology* / Q000382:microbiology / Q000635:transmission; D004926:Escherichia coli / Q000201:enzymology* / Q000235:genetics / Q000302:isolation & purification; D004927:Escherichia coli Infections / Q000201:enzymology / Q000453:epidemiology* / Q000382:microbiology / Q000635:transmission; D005260:Female; D006748:Hospital Departments / Q000706:statistics & numerical data; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007710:Klebsiella Infections / Q000201:enzymology / Q000453:epidemiology* / Q000382:microbiology / Q000635:transmission; D007711:Klebsiella pneumoniae / Q000201:enzymology* / Q000235:genetics / Q000302:isolation & purification; D008297:Male; D008875:Middle Aged; D010802:Phylogeny; D015995:Prevalence; D013030:Spain / Q000453:epidemiology; D013379:Substrate Specificity; D018440:beta-Lactam Resistance / Q000235:genetics; D001618:beta-Lactamases / Q000145:classification / Q000235:genetics*
D001618:beta-Lactamases
Caracterización y epidemiología molecular de betalactamasas de espectro extendido en Escherichia coli y Klebsiella pneumoniae en once hospitales españoles (2004).