immune system antibody or drug for fight off alien, bacteria, flu viruses, corana viruses and foreign substances in the blood

2019ncov and antibodies antibody antigen antigens attack background bacteria biology blood cell cells convid19 corana corona disease drug enzyme flu foreign health human illness illustration immune immunoglobulin immunoglobulins infected influenza isolated macrophage medical medicine molecule monoclonal plasma primary protein proteins proten rendering research response sars sarscov2 science structure substances system therapy vaccine vector virus viruses white