Genes may pertain-to a virus.Logical formLearned from58 sentences. A virus may return.Logical formLearned from58 sentences. Virus can be a virus.Logical formLearned from58 sentences. Virus may undergo a detection.Logical formLearned from58 sentences. A virus may undergo a reactivation.Logical formLearned from58 sentences. Thousands can be constituted-of-or-filled-with (computer viruses).Logical formLearned from58 sentences. A virus can be terrible.Logical formLearned from58 sentences. A level may pertain-to a virus.Logical formLearned from58 sentences. A virus may lie dormant.Logical formLearned from58 sentences. A virus may kill.Logical formLearned from58 sentences. A (h5n1 virus) can be virulent.Logical formLearned from58 sentences. A period may pertain-to a virus.Logical formLearned from58 sentences. Carriers may pertain-to a virus.Logical formLearned from57 sentences. A virus may arrive.Logical formLearned from57 sentences. Viruses can be exotic.Logical formLearned from57 sentences.