E.coli is the most suitable host for developing a pure phage culture. Phages infect the hosts cellular machinery , multiply and lyse the cell to infect other healthy cells. Pure culture is prepared by isolating them from natural sources. Next Steps involved are enrichment , filtaration and bacteriophage titration . It is followed by plaque assy and broth clearing assay. Solution E.coli is the most suitable host for developing a pure phage culture. Phages infect the hosts cellular machinery , multiply and lyse the cell to infect other healthy cells. Pure culture is prepared by isolating them from natural sources. Next Steps involved are enrichment , filtaration and bacteriophage titration . It is followed by plaque assy and broth clearing assay..