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MLVA cluster factor model of virulence parameter estimates and their 95% confidence intervals (C.I.), along with groupings as indicated by post-hoc testing. MLVA cluster A3b was the arbitrarily set referent factor level and therefore is set at 0. Groups 1 and 2 are overlapping, indicating that there may be as few as three statistically significant different virulence groups or as many as five.
