colorful depiction of a virus, submicroscopic infectious agent replicating inside living cells

medicine virus particle microbiology background medical disease health infect life biochemistry epidemic concept molecular biology illness microscopic design infection science graphic vaccine particles recovery sign core pandemic macro research biotechnology magnification closeup organic innovation substance circle organism micro inflammation sick scientific germ microorganism nature replication replicate cell immune system reaction colorful depiction submicroscopic infectious agent replicating inside living cells generated