title: Avian influenza detected in swans in central Europe, and continues spread in Nigeria.
mesh_terms: D000818:Animals; D001717:Birds; D021821:Communicable Diseases, Emerging / Q000453:epidemiology* / Q000662:veterinary*; D004196:Disease Outbreaks / Q000706:statistics & numerical data* / Q000662:veterinary*; D004641:Emigration and Immigration; D005060:Europe / Q000453:epidemiology; D006801:Humans; D015994:Incidence; D053124:Influenza A Virus, H5N1 Subtype / Q000302:isolation & purification*; D005585:Influenza in Birds / Q000453:epidemiology*; D009549:Nigeria / Q000453:epidemiology; D011159:Population Surveillance; D018570:Risk Assessment / Q000379:methods*; D012307:Risk Factors