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Ключевые слова:
antibiotics, avian influenza, bacterium, blood, contagious, contagious disease, cough, diagnosis, disease, epidemic, epidemiology, fever, flu, flu epidemic, flu strain, health, health risk, healthcare, illness, immunity, infect, infected, infection, influenza, influenza microbe, influenza pandemic, influenza virus, medical, medicine, microbiology, microorganism, pathogen, pathogenic, pathology, pneumonia, prevention, public health, respiratory, sick symptom, sickness, symptoms, treatment, vaccine, viral infection, virology, virus,