A computer may be infected by a virus.Logical formLearned from16 sentences. Infection can be by a virus.Logical formLearned from16 sentences. A natural reservoir may pertain-to a virus.Logical formLearned from16 sentences. An infection may be caused by viruses.Logical formLearned from16 sentences. Vaccines can be against viruses.Logical formLearned from16 sentences. A virus may be knowned as respiratory virus.Logical formLearned from16 sentences. Viruses can be hybrid.Logical formLearned from16 sentences. A virus can be fragile.Logical formLearned from16 sentences. Viruses can be troublesome.Logical formLearned from16 sentences. A male may be diagnosed with a virus.Logical formLearned from16 sentences. A virus may cause genital herpes.Logical formLearned from16 sentences. (Computer viruses) can be malicious.Logical formLearned from16 sentences. A virus can be cell-free.Logical formLearned from16 sentences. Viruses may occur among birds.Logical formLearned from16 sentences. A virus may be seen.Logical formLearned from16 sentences.