  The electromagnetic field inside an isotropic optically active medium is
quantized on the base of Fedorov's model for optical activity. The modified
photon propagator is derived. Using this result it is shown that the QED
correction to the electron mass contains chiral terms which nevertheless are
parity invariant. The spontaneous emission rate of a two-level atom is shown to
increase in the medium. The spontaneously emitted radiation is partially
polarized.
