8 research outputs found
PROPAGATION OF ANTIMICROBIAL RESISTANT Salmonella spp. IN BIVALVE MOLLUSKS FROM ESTUARY AREAS OF BAHIA, BRAZIL
Potential Exposure Risk Associated with the High Prevalence and Survival of Indicator and Pathogenic Bacteria in the Sediment of Vembanadu Lake, India
Prevalence of faecal coliform bacteria and the
survival of Escherichia coli, Vibrio parahaemolyticus and
Salmonella paratyphi were studied in the water and sediment
from Vembanadu Lake in the presence and absence
of protozoan predators. The density of faecal coliform bacteria
ranged between mean MPN value 5080â9000/100 ml
in water and 110,000â988,000/1 g in sediment (p <0.01),
which was 110 times greater than in overlying water. The
laboratory microcosm studies revealed that E. coli, V. parahaemolyticus
and S. paratyphi showed significantly higher
survival (p <0.05) potential in sediment than in overlying
water both in the presence and absence of protozoan predators.
The results indicate that Vembanadu Lake sediment
constitutes a reservoir of pathogenic bacteria and exhibits
potential health hazard from possible resuspension and subsequent
ingestion during recreational activities. Therefore,
assessment of bacterial concentration in freshwater lake sediments
used for contact and non-contact recreation is of considerable
significance for the proper assessment of microbial pollution of the overlying water and the management
and protection of related health risk at specific recreational
sites. In addition, assessment of the bacterial concentration
in sediments can be used as a relatively stable indicator of
long-term mean bacterial concentration in the water column
above.Cochin University of Science and
TechnologyWater Qual Expo Health (2010) 2: 105â11
Potential public health significance of faecal contamination and multidrug-resistant Escherichia coli and Salmonella serotypes in a lake in India
To assess the prevalence of faecal coliform bacteria and multiple drug resistance
among Escherichia coli and Salmonella serotypes from Vembanadu Lake.
Study design: Systematic microbiological testing.
Methods: Monthly collection of water samples were made from ten stations on the southern
and northern parts of a salt water regulator constructed in Vembanadu Lake in order to
prevent incursion of seawater during certain periods of the year. Density of faecal colifrom
bacteria was estimated. E. coli and Salmonella were isolated and their different serotypes
were identified. Antibiotic resistance analysis of E. coli and Salmonella serotypes was done
and the MAR index of individual isolates was calculated.
Results: Density of faecal coliform bacteria ranged from mean MPN value 2900 -7100/100ml.
Results showed multiple drug resistance pattern among the bacterial isolates. E. coli
showed more than 50% resistance to amickacin, oxytetracycline, streptomycin, tetracycline
and kanamycin while Salmonella showed high resistance to oxytetracycline, streptomycin,
tetracycline and ampicillin. The MAR indexing of the isolates showed that they
have originated from high risk source such as humans, poultry and dairy cows.
Conclusions: The high density of faecal coliform bacteria and prevalence of multi drug
resistant E. coli and Salmonella serotypes in the lake may pose severe public health risk
through related water borne and food borne outbreaksCochin University of Science and TechnologyPublic health 1 2 5 ( 2 0 1 1 ) 3 7 7-3 7