Table 1. Predicted results of crosses among hosts of two strains of Wolbachia (A and B) when the Wolbachia strains are both present in superinfected (A+B) individuals as well as in singly infected (A and B) individuals or are absent (U, uninfected).
| Female type |
Male type |
|||
|---|---|---|---|---|
| U | A | B | A + B | |
| U | + | − | − | − |
| A | + | + | − | − |
| B | + | − | + | − |
| A + B | + | + | + | + |
The pattern shown here pertains when both strains cause CI individually, and there is bidirectional incompatibility between the two strains. In general, incompatibility (−) is predicted when the male host harbors a Wolbachia strain not present in the female mate. Successful matings (+) occur when males have the same, or fewer strains of Wolbachia than the female. Note that superinfected males are predicted to be incompatible with all but superinfected females. (modified from Dobson et al., 2004).