  Results are presented on hyperon and antihyperon production in Pb-Pb, pPb and
pBe collisions at 158 GeV/c per nucleon. Lambda, Xi and Omega yields have been
measured at central rapidity and medium transverse momentum as functions of the
centrality of the collision. Comparing the yields in Pb-Pb to those in pBe
interactions, strangeness enhancement is observed. The enhancement increases
with the centrality and with the strangeness content of the hyperons, reaching
a factor of about 20 for the Omega in the central Pb-Pb collisions.
