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Mean (±SE) Rt values for eight swine (red) and six human (gray) viruses in distilled water at salinities ranging from 0 to 30 ppt. The temperature was held constant at 17°C, and the pH was 7.2. Significant differences in the responses for swine and human viruses existed at 20 ppt (*, P < 0.05). No statistically significant differences were observed in the responses for swine and human viruses at any other saline concentration at an α value of 0.05.
