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abstract, background, biological specimen, biology, cellular structure, clinical analysis, closeup, coronavirus, covid19, dark, detailed, diagnostic tool, disease, disease transmission, experimental study, healthcare, healthcare crisis, infection, infectious agent, infectious disease, laboratory, laboratory equipment, medical, medical research, microbiology, microscope, microscopic, microscopic detail, microscopic view, molecular, molecular biology, outbreak, outbreak investigation, pandemic, particle, pathogen, pathogenic microbe, public health concern, red, research, science, scientific illustration, structure, viral particle, virus,