  In this work, dissipative quantum backflow is studied for a superposition of
two stretched Gaussian wave packets and two identical spinless particles within
the Caldirola-Kanai framework. Backflow is mainly an interference process and
dissipation is not able to suppress it in the first case. For two identical
spinless particles, apart from interference terms, the symmetry of the wave
function seems to be crucial in this dynamics. The combined properties make
bosons display this effect, even for the dissipative regime but, for fermions,
backflow is not exhibited in any regime, dissipative and nodissipative. The
anti-symmetric character of the corresponding wave function seems to be strong
enough to prevent it. For bosons, backflow is also analyzed in terms of
fidelity of one-particle states which is a well-known property of two quantum
states. At very small values of fidelity, this effect is not seen even for
bosons.
