Catalysis of the transfer of a solute or solutes from one side of a membrane to the other according to the reaction: sialate(out) + cation(out) = sialate(in) + cation(in).
Catalysis of the transfer of a solute or solutes from one side of a membrane to the other according to the reaction: sialate(out) + cation(out) = sialate(in) + cation(in).