  The subject of the charged-to-neutral yield ratio for B{\bar B} and D{\bar
D}pairs near their respective thresholds in e^+e^- annihilation is revisited.
As previously argued for the B mesons, this ratio should exhibit a substantial
variation across the Upsilon(4S) resonance due to interference of the resonance
scattering phase with the Coulomb interaction between the charged mesons. A
simple alternative derivation of the expression describing this effect is
presented here, and the analysis is extended to include the D meson production
in the region of the psi(3770) resonance. The available data on Kaon production
at the phi(1020) resonance are also discussed in connection with the expected
variation of the charged-to-neutral yield ratio.
