3d of blood cells in a human body, medical concept, witness the immune system's fight against pathogens

generated coronavirus virus infection infectious bacterium microbiology disease microscopic epidemic pandemic health sickness illness medical biology medicine background cell microscope science microbe bacteriology human bacteria scientific oncology malignant cancer tumor cells immune macro target kill macrophage system immunotherapy proteins patient dna research lymphocyte antibody cytotoxic body vessels blood concept witness system#39aph39#s fight pathogens stunning imagery