Persons may have a flu.Logical formLearned from12 sentences. A threat may pertain-to a flu.Logical formLearned from12 sentences. A (bird flu) can be notorious.Logical formLearned from12 sentences. A flu may be ravaged.Logical formLearned from12 sentences. Concern can be about flu.Logical formLearned from12 sentences. A version may pertain-to a (flu virus).Logical formLearned from12 sentences. A (flu vaccine) can be scarce.Logical formLearned from12 sentences. A (flu virus) can be mysterious.Logical formLearned from12 sentences. A cure can be for flu.Logical formLearned from12 sentences. Vaccines can be for a flu.Logical formLearned from12 sentences. Protection can be against a flu.Logical formLearned from12 sentences. Flu can be a disease.Logical formLearned from12 sentences. (Flu seasons) can be regular.Logical formLearned from12 sentences. Some persons may test positive for flu.Logical formLearned from12 sentences. A country may document cases of flu.Logical formLearned from12 sentences.