Ключевые слова: aids, background, bacteria, biology, blood, cell, contagious, corona virus, corona viruses, coronavirus, covid, dangerous, death, diagnosis, disease, epidemic, flu, health, health care, ill, illness, infect, infected, influenza, life, medical, medicine, micro, microbe, microbiology, microscope, microscopic, pandemic, science, scientific, virology, virus, virus attack,