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analyzing, avian flu, biology, bird flu, blood, cdc, chemical, cold, common cold, death, disease, epidemic, fever, h1n1, h5n1, hematology, hospital, illness, immunology, infection, influenza virus, medical, medical exam, medical technology, medical test, medicine, micro organism, microbiology, outbreak, patient, plague, pneumonia, research, science, scientific experiment, serology, spanish flu, spreading, technology, test, virology, virus,