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Bacterial challenge test of phages against their respective host Salmonella serovars. (a) Bacterial challenge test of phage PRF-SP1 and PRF-SP3 against S. Paratyphi A. S. Paratyphi A without phage infection was used as control. (b) Bacterial challenge test of phage PRF-SP4 and PRF-SP5 against S. Paratyphi B. S. Paratyphi B without phage infection was used as control. OD600nm was measured via a spectrophotometer.
