Vaccines; Modified cells for medical or clinical use; Pharmaceuticals for the prevention or treatment of COVID19; Pharmaceuticals for the prevention or treatment of infection with respiratory syncytial virus (RSV); Oral vaccine preparations; Pharmaceutical products for the treatment of infectious diseases; Recombinant yeast-based pharmaceutical products; Yeast-based oral vaccines; Pharmaceutical preparations, namely, a drug delivery system comprising yeast-based oral vaccines; Pharmaceutical ...