Vaccines can be for viruses.Logical formLearned from16 sentences. A male may be infected with a virus.Logical formLearned from16 sentences. A virus may be used.Logical formLearned from16 sentences. An absence may pertain-to a virus.Logical formLearned from16 sentences. Infection can be by a human (immunodeficiency virus).Logical formLearned from16 sentences. Viruses may undergo an isolation.Logical formLearned from16 sentences. A virus can be (computer program).Logical formLearned from16 sentences. Viruses can be (computer programs).Logical formLearned from16 sentences. Viruses may undergo an understanding.Logical formLearned from16 sentences. A virus may hide between outbreaks.Logical formLearned from16 sentences. Viruses may propagate.Logical formLearned from16 sentences. Viruses may be written/wrote.Logical formLearned from16 sentences. Items can be as viruses.Logical formLearned from16 sentences. Virus may be discovered.Logical formLearned from16 sentences. Effects may pertain-to a virus.Logical formLearned from16 sentences.