Heterosubtypic Immunity to Influenza A Virus Infections in Mallards May Explain Existence of Multiple Virus Subtypes
Figure 3
Contingency table for HA re-infections with the IAV subtypes most frequently isolated.
Rows represent the HA subtype in the first detected infection and columns the HA from an infection retrieved ≥7 days later. The number in each box represents the number of cases, together with standardized Pearson's residuals in brackets. Red boxes show negative values and represent a deficiency of cases, blue boxes show positive values and an overrepresentation of cases, and grey denote cases that do not depart from expected values. The dendrogram on top illustrates HA subtype phylogenetic relatedness.