5 Pharmaceuticals, including drug delivery agents in the form of exosomes that facilitate the delivery of pharmaceutical preparations; pharmaceutical preparations and substances, including drug delivery agents in the form of exosomes that facilitate the delivery of pharmaceutical preparations; pharmaceutical preparations, namely, a drug delivery system comprising genetically engineered or purified exosomes for therapeutic use, including those that facilitate the delivery of pharmaceutical preparations for therapeutic use; pharmaceutical preparations, namely, exosomes to deliver protein for genetic therapy, including those that facilitate the delivery of pharmaceutical preparations; medicine, including drug delivery agents in the form of exosomes that facilitate the delivery of pharmaceutical preparations; medical preparations and articles, including drug delivery agents in the form of exosomes that facilitate the delivery of pharmaceutical preparations; biological preparations for medical purposes, including for the treatment of cancer, diabetes, obesity, metabolic syndrome, dementia, and other aging associated pathologies such as mitochondrial disease, joint and ligament strains and tears, muscle atrophy, and muscular dystrophy; biological preparations for the treatment of cancer, diabetes, obesity, metabolic syndrome, dementia, and other aging associated pathologies, including mitochondrial disease, joint and ligament strains and tears, muscle atrophy, muscular dystrophy; biological preparations comprising exosome, including drug delivery agents in the form of exosomes that facilitate the delivery of pharmaceutical preparations; biological preparations comprising a therapeutic target protein-loaded exosome, including drug delivery agents in the form of exosomes that facilitate the delivery of pharmaceutical preparations; biological preparations comprising exosome for pharmaceutical purposes, including drug delivery agents in the form of exosomes that facilitate the delivery of pharmaceutical preparations; biological reagents for medical use, including drug delivery agents in the form of exosomes that facilitate the delivery of pharmaceutical preparations; mixed biological preparations for medical purposes, including for the prevention and treatment of infectious diseases; mixed biological preparations for the prevention and treatment of infectious diseases; diagnostic reagents used in the fields of biological, genetic engineering and pharmaceutical research; diagnostic reagents comprising exosome used in the fields of biological, genetic engineering and pharmaceutical research; pharmaceuticals, medicines, biologics, biotherapeutics, biosimilars and therapeutics, namely, extracellular vesicle (EV)-based nucleic acid therapeutics for the prevention and treatment of infections or disease, including infectious diseases; diagnostic kits comprised of medical diagnostic reagents and assays for testing of bodily fluids for use in disease detection; diagnostic kits comprised of medical diagnostic reagents and assays for testing of exosomes for use in disease detection; diagnostic kits comprised of medical diagnostic reagents and assays that test for the presence of cancer, diabetes, obesity, metabolic syndrome, dementia, and other aging associated pathologies, including including mitochondrial disease, joint and ligament strains and tears, muscle atrophy, and muscular dystrophy