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Molecular Identification of Multiple Antibiotic Resistant Fish Pathogenic Enterococcus faecalis and their Control by Medicinal Herbs
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Molecular Identification of Multiple Antibiotic Resistant Fish Pathogenic Enterococcus faecalis and their Control by Medicinal Herbs
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Journal Article
Molecular Identification of Multiple Antibiotic Resistant Fish Pathogenic Enterococcus faecalis and their Control by Medicinal Herbs
2017
Overview
The opportunistic fish pathogen,
Enterococcus faecalis
has been reported to cause mass mortality in several fish species in different countries. The objectives of this study were to (i) identify
E
.
faecalis
from the diseased fishes through molecular techniques; (ii) assess the antibiotic susceptibility profile of
E
.
faecalis
isolates; and (iii) control disease in tilapia fish by treatment with medicinal plant extracts. A total of 48 isolates were phenotypically identified as
Enterococcus
species from tilapia, stinging catfish and walking catfish cultivated in several fish farms in Gazipur. Ten randomly selected isolates were identified as
E.
faecalis
by 16S rRNA gene sequencing. Artificial infection revealed that most of the isolates caused moderate to high mortality in fishes with characteristic disease symptoms. These isolates exhibited resistance to multiple antibiotics
in vitro
. Bioassay revealed that organic extracts of
Tamarindus indica
and
Emblica officinalis
leaves,
Allium sativum
bulb, and
Syzygium aromaticum
bud inhibited the growth of
E
.
faecalis
. Methanol extracts of
A
.
sativum
and methanol and acetone extracts of
S
.
aromaticum
significantly reduced the mortality of fish artificially infected with
E
.
faecalis
as both preventive and therapeutic agents. This is the first report on molecular identification, and herbal control of fish pathogenic
E
.
faecalis
in Bangladesh.
