The Linear Relationship between the Proportion of Mixed Infections and the Incidence of Each Pathogen Involved in the Infection.

<p>(A) Mixed infections, including triple and quadruple pathogen infections. (B) Co-infections involving two pathogens. (C) Mixed infections involving three pathogens. Notes: Y{LN[P(co-infections)]} denotes the logarithm of the proportion of co-infections for pathogens 1 and 2 in all cases (39,756); X{LN[P(pathogen 1)]} denotes the logarithm of the proportion of pathogen 1 (including single and multiple infections) in all cases (39,756) and LN[P(pathogen 2)] that for pathogen 2; X₁ denotes {LN[P(pathogen 1)]+LN[P(pathogen 2)]}; and X₂ denotes {LN[P(pathogen 1)]*LN [P(pathogen 2)]}.