microbiology banner. collection of different types of microorganisms. scientific in sketch style

virus bacteria microorganism design horizontal background banner analysis medical health plague frame rabies sketch hand drawn drawing doodle set type germ bacterium cholera epidemic unicellular cell molecule biology microbiology gut microbe flu micro organism disease vector microbiota lactobacillus bifidobacterium probiotic protozoa ameba plankton science microscopic bacillus pathogen streptococcus amoeba engraving web collection types microorganisms scientific style banner microorganisms