The asymptotic chi-square distribution of twice the log likelihood ratio showed that the interaction between hives and strains was not significant (LR = 5.717; df = 5; p = 0.4556), but that the factors “strain” (LR = 15.941; df = 2; p = 0.0003) and “hive” (LR = 47.285; df = 3; p<0.0001) were both highly significant predictors of infection-induced mortality.
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Genetic variation in virulence among chalkbrood strains infecting honeybees.
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