A war can be on (bird flu).Logical formLearned from19 sentences. Chickens may be infected with (bird flu).Logical formLearned from19 sentences. Some nations may tackle outbreaks of (bird flu).Logical formLearned from19 sentences. A case may pertain-to a (flu virus).Logical formLearned from18 sentences. Persons may get flu.Logical formLearned from18 sentences. A world-city may die from (bird flu).Logical formLearned from18 sentences. (Bird flu) can be in a continental-region.Logical formLearned from18 sentences. (Bird flu) may undergo a surveillance.Logical formLearned from18 sentences. Evidence can be constituted-of-or-filled-with (bird flu).Logical formLearned from18 sentences. Criteria can be for announcing an end to (bird flu outbreaks).Logical formLearned from18 sentences. A (bird flu) can be contracted.Logical formLearned from18 sentences. A (flu season) can be upon persons.Logical formLearned from18 sentences. (Flu shots) may be given.Logical formLearned from18 sentences. A flu may undergo a prevention.Logical formLearned from18 sentences. A height may pertain-to a (flu season).Logical formLearned from18 sentences.