A surface may pertain-to a (flu virus).Logical formLearned from19 sentences. A virus may cause an epidemic.Logical formLearned from19 sentences. Researcher may find a virus.Logical formLearned from19 sentences. Blood may be infected with a virus.Logical formLearned from19 sentences. A virus can be a disease.Logical formLearned from19 sentences. A woman may die of virus.Logical formLearned from18 sentences. Some patients may test positive for a virus.Logical formLearned from18 sentences. A case may pertain-to a (flu virus).Logical formLearned from18 sentences. An epicenter may pertain-to a virus.Logical formLearned from18 sentences. (Dna viruses) can be stranded.Logical formLearned from18 sentences. A virus can be in a system.Logical formLearned from18 sentences. Viruses may be found.Logical formLearned from18 sentences. A virus may cause disease.Logical formLearned from18 sentences. A virus may cause hepatitis.Logical formLearned from18 sentences. A virus may be detected in birds.Logical formLearned from18 sentences.