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Lowand intermediate-mass Higgs bosons decay preferably into fermion pairs. The one-loop electroweak corrections to the respective decay rates are dominated by a Savor-independent term of O(Gs m~). We calculate the two-loop gluon correction to this term It. turns out that this correction screens the leading high-mt behavior of the one-loop result by roughly 10%. We also present the twoloop QCD correction to the contribution induced by a pair of fourth-generation quarks with arbitrary masses. Asdoi:10.3204/pubdb-2017-05392 fatcat:65xnkyavbvci5iragnofy4d3h4