Fig. 1From: Molecular and serological investigation of Hepatitis E virus in pigs slaughtered in Northwestern ItalyHeat map of the Phi correlation index ranging from 1 to -1. Red colour highlights a strong positive association and a high level of agreement (darker reds evidence a stronger association) concerning blue colour that shows a negative association and disagreement. White colour (Phi = 0) evidence of no association and no agreementBack to article page