Ключевые слова: bacteria, bacteriologist, bacteriology, biology, cell, contagiousness, dangerous microorganisms, disease, epidemic, epidemiology, health protection, infection, laboratory, medical diagnosis, medicine, microanalysis, microbial community, microbial hazard, microbiology, microbiota, microorganisms, microscope, microscopic imaging, microworld, pandemic, pathogen, pathogenic threat, protection against bacteria, protection against viruses, science, viral attack, virologist, virology, virus,