antibiotics, asian flu, avian influenza, bacterial infection, bacterium, biology, bird flu, concept, contagious, coronavirinae, coronavirus, coronaviruse disease, coronaviruses, diagnosis, epidemic, fever, flu mask, flu outbreak, germ mask, health, health risk, human influenza, illness, immunity, influenza, influenza background, lethal, medical, medical mask, microbe, microbiology, new strain, pandemic, pathogen, pathology, public health, retrovirus, sars, science, sickness, superbug, symptoms, treatment, vaccine, virology, virus
