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2017 ; 10
(8
): 973-978
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Isolation and characterization of bacteriophages with lytic activity against
common bacterial pathogens
#MMPMID28919692
Shende RK
; Hirpurkar SD
; Sannat C
; Rawat N
; Pandey V
Vet World
2017[Aug]; 10
(8
): 973-978
PMID28919692
show ga
AIM: Present investigation was conducted to isolate and characterize
bacteriophages with lytic activity against common bacterial pathogens. MATERIALS
AND METHODS: A total of 60 samples of animal waste disposal from cattle (42) and
buffalo (18) farms were collected from three different strata, i.e., top, mid,
and bottom of collection tank. Samples were primarily subjected to rapid
detection methods, and then isolation of phage was done by double agar layer
method using Bacillus subtilis (BsH) and Escherichia coli (EH) as host system.
Phages were characterized on the basis of plaque morphology, temperature, pH
susceptibility, and host range. RESULTS: Recovery of phages was higher from dairy
cattle farm waste (78.57%) as compared to buffalo farm waste (72.22%) and bottom
layer of tank showed maximum recovery. Bacillus subtilis (91%) supported the
growth of more phages as compared to E. coli (9%). Three different phage
morphotypes were observed each against Bacillus subtilis (BsHR(1), BsHR(2), and
BsHR(3)) and E. coli (EHR1, EHR(2), and EHR(3)). Mean phage titer of above six
phage isolates ranged between 3×10(10) and 5×10(12) plaque forming units/ml.
Viability of phages was by, and large unaffected at 70°C within 2-3 min, and
phage isolates were completely inactivated below pH 3 and above 11. Coliphage
EHR(1) had widest host range followed by BsHR(1) and BsHR(2) while EHR(2),
EHR(3), and BsHR(3) had low lytic activity. CONCLUSION: It could be concluded
from the present study that the Bacillus and Coli phage has wide host range and
thus exhibits the potential to be used as drug substitute tool against common
bacterial pathogens.