The present invention relates to: a drug delivery composition comprising a pharmaceutical effective amount of drugs and mesenchymal stem cells, which can effectively treat bacteria having resistance and to a composition for diagnosing and treating infectious diseases.COPYRIGHT KIPO 2016약학적 유효량의 약물 및 중간엽 줄기세포를 포함하는, 약물전달 조성물, 및 감염질환 진단 및 치료용 조성물에 관한 것이다.