Mp. Combarro et al., LISTERIA SPECIES INCIDENCE AND CHARACTERIZATION IN A RIVER RECEIVING TOWN SEWAGE FROM A SEWAGE-TREATMENT PLANT, Water science and technology, 35(11-12), 1997, pp. 201-204
Citations number
12
Categorie Soggetti
Water Resources","Environmental Sciences","Engineering, Civil
This study evaluated the ability of a sewage treatment plant to elimin
ate Listeria species and the incidence of Listeria species in the rive
r receiving the effluent. The average efficiency of removal of Listeri
a species in the treatment plant was 92%. Despite the efficiency of th
e plant being within the limits established by the EC Directive in ter
ms of BOD5 decrease, an increase in the levels of Lislen'a species was
still observed downstream from the plant. The species isolated with g
reatest frequency, both in the influent and effluent as well as the ri
ver water, was L. monocytogenes followed by L. seeligeri and L. welshi
meri. L. ivanovii was only found in very low proportions in the river
samples. The analysis of the sensitivity of Listeria species to 22 ant
imicrobial agents demonstrated the presence of a high percentage of ba
cteria resistant to aztrenam, cefuroxme, cetriaxone and to a leser deg
ree moxalactam and cefotaxime. in contrast, resistance to aminoglycosi
des and tetracycline was only observed in a low number of isolates. (C
) 1997 IAWQ. Published by Elsevier Science Ltd.