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We present results for screening masses of mesons built from light andstrange quarks in the temperature range of approximately between 140 MeV to 800MeV. The lattice computations were performed with 2+1 dynamical light andstrange flavors of improved (p4) staggered fermions along a line of constantphysics defined by a pion mass of about 220 MeV and a kaon mass of 500 MeV. Thelattices had temporal extents Nt = 4, 6 and 8 and aspect ratios of Ns / Nt \geq4. At least up to a temperature of 140 MeV the pseudo-scalar screening massremains almost equal to the corresponding zero temperature pseudo-scalar (pole)mass. At temperatures around 3Tc (Tc being the transition temperature) thecontinuum extrapolated pseudo-scalar screening mass approaches very close tothe free continuum result of 2 \pi T from below. On the other hand, at hightemperatures the vector screening mass turns out to be larger than the freecontinuum value of 2 \pi T. The pseudo-scalar and the vector screening massesdo not become degenerate even for a temperature as high as 4Tc. Using thesemesonic spatial correlation functions we have also investigated the restorationof chiral symmetry and the effective restoration of the axial symmetry. We havefound that the vector and the axial-vector screening correlators becomedegenerate, indicating chiral symmetry restoration, at a temperature which isconsistent with the QCD transition temperature obtained in previous studies. Onthe other hand, the pseudo-scalar and the scalar screening correlators becomedegenerate only at temperatures larger than 1.3Tc, indicating that theeffective restoration of the axial symmetry takes place at a temperature largerthan the QCD transition temperature.

Meson screening masses from lattice QCD with two light and the strange quark