Forms may pertain-to a virus.Logical formLearned from74 sentences. Viruses may evolve.Logical formLearned from74 sentences. A threat may pertain-to a virus.Logical formLearned from73 sentences. Children may be infected with a virus.Logical formLearned from73 sentences. A cases may pertain-to a virus.Logical formLearned from73 sentences. A virus can be discovered.Logical formLearned from72 sentences. A virus can be altered.Logical formLearned from72 sentences. Viruses may undergo an evolution.Logical formLearned from72 sentences. A virus may undergo an evolution.Logical formLearned from71 sentences. A virus may undergo destruction.Logical formLearned from71 sentences. A virus may be sickened.Logical formLearned from71 sentences. Infection can be with a human (immunodeficiency virus).Logical formLearned from70 sentences. A virus may pertain-to a us-state.Logical formLearned from70 sentences. A sign may pertain-to a virus.Logical formLearned from70 sentences. A virus can be man-made.Logical formLearned from70 sentences.