Migratory birds may spread a flu.Logical formLearned from12 sentences. Persons may catch (bird flu).Logical formLearned from12 sentences. (Bird flu) may sweep through a continent.Logical formLearned from12 sentences. (Bird flu) may infect chickens.Logical formLearned from12 sentences. Some persons may be suspected of having (bird flu).Logical formLearned from12 sentences. A pope may suffer from a flu.Logical formLearned from12 sentences. A flu may undergo a treatment.Logical formLearned from12 sentences. A man can be with flu.Logical formLearned from12 sentences. Deaths can be from flu.Logical formLearned from12 sentences. (Flu outbreaks) may start.Logical formLearned from12 sentences. Cases of flu can be persons.Logical formLearned from12 sentences. Avian flu may strike.Logical formLearned from12 sentences. A (flu season) may pertain-to a northern hemisphere.Logical formLearned from12 sentences. A woman may be tested for flu.Logical formLearned from12 sentences. A mix can be constituted-of-or-filled-with (flu viruses).Logical formLearned from12 sentences.