M. Arvanitidou et al., TRANSFERABLE ANTIBIOTIC-RESISTANCE AMONG SALMONELLA STRAINS ISOLATED FROM SURFACE WATERS, Water research, 31(5), 1997, pp. 1112-1116
Resistance to 20 antimicrobials was tested in 79 Salmonella strains is
olated from river and lake waters in northern Greece. Of the strains,
19 (24.1%) exhibited resistance to one or more of the antibiotics whil
e single, double and multiple resistances were oberved in 12.7, 6.3 an
d 5.1% of the isolates, respectively. Streptomycin resistance was the
most common and nine different antibiotic resistance patterns were rec
orded in total. All of the strains were susceptible to amoxycillin-cla
vulanate, cefuroxime, ciprofloxacin, colistin, amikacin and apramycin.
Among the resistant salmonellas, five (26.3%) were able to transfer R
factors to the Escherichia coli recipient. Resistance to ampicillin a
nd ticarcillin was transferable in four cases, resistance to chloramph
enicol, trimethoprim and sulfafurazole in two cases, whereas resistanc
e to gentamicin, tobramycin, spectinomycin, kanamycin and tetracycline
was transferable in one case. Chloramphenicol resistance, in one of t
he two cases, was transferable only after mobilization with the X+ Fac
tor while streptomycin resistance, although prevailing, was not found
to be transferable even after mobilization. The geometric means of the
fecal indicator bacteria, i.e. total coliforms, fecal coliforms and f
ecal streptococci did not significantly differ between samples with an
tibiotic sensitive and resistant Salmonella isolates. (C) 1997 Elsevie
r Science Ltd.