bacteria are a type of biological cell. micro organisms, duplication and propagation. formation of bacteria and microorganisms

abstract are background bacteria bacterium biological biology cancer cartoon cell character closeup collection colorful creature danger disease duplication education epidemic flat flu formation germ health human icon illness immune infection infectious influenza isolated life macro medical medicine micro microbe microbiology microorganism microorganisms microscope microscopic monster nature organism organisms pathogen propagation render science scientific seen set sick type viral virus