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antibiotics, bacterial infection, bacterium, biology, bird flu, concept, contagious, coronavirinae, coronavirus, covering, deadly virus, diagnosis, disease, epidemic, european, flu, flu outbreak, girl, hands, health, health risk, human influenza, illness, immunity, infection, influenza, lethal, mask, medical, medicine, microbe, microbiology, mouth, outside, pandemic, passenger, pathogen, pathology, person, pneumonia, public, science, sickness, symptoms, travel, virus,