Exercise-induced immune perturbations have been proposed to increase susceptibility to viral infections. We investigated the replication of persisting viruses as indicators of immune function in elite cross-country skiers after ten months of sustained high-performance exercise. The viruses evaluated. nine human herpesviruses (HHVs) and torque teno virus (TTV). https://hollandscountryclothinges.shop/product-category/horse-saddles/