respiratory diseases viruses. hand drawn set of microorganisms. scientific in sketch style

rsv respiratory syncytial airborne transmitted mask virus bacteria microorganism enterovirus influenza adenovirus rhinovirus coronavirus sketch hand drawn engraving pen pencil etch drawing doodle set type germ bacterium epidemic cell molecule microbiology microbe micro organism disease vector science microscopic bacillus pathogen fever isolated black white element pandemic microscope infection illness diseases viruses microorganisms scientific style viruses microorganisms style