  I describe a calculation of B meson mixing at one-loop in staggered chiral
perturbation theory, for the complete set of Standard Model and
beyond-the-Standard Model operators. The particular lattice representation of
the continuum operators used by the Fermilab Lattice/MILC collaborations (and
earlier by the HPQCD collaboration) turns out to be important, and results in
the presence of "wrong-spin" operators, whose contributions however vanish in
the continuum limit. The relation between staggered and naive fermions also
plays a key role.
