The Multistrain Probiotic OMNi-BiOTiC® Active for Upper Respiratory Tract Infections in Older People

The goal of this randomised controlled trial is to determine the effect of consuming a multistrain probiotic OMNi-BiOTiC® Active to shorten the incidence and duration of acute upper respiratory tract infections (URTIs) in older people. The main questions it aims to answer is: * Is the multistrain probiotic OMNi-BiOTiC® Active effective in reducing the incidence of URTIs in older people? * Is the multistrain probiotic OMNi-BiOTiC® Active effective in reducing the duration of URTIs in older people? * Is the multistrain probiotic OMNiBiOTiC® Active effective in changing selected immunological blood parameters in older people? Researchers will compare the probiotic group and the placebo group to see if the incidence or duration of URTIs are significant among the groups.