A virus can be undetected.Logical formLearned from16 sentences. A (stomach virus) can be horrible.Logical formLearned from16 sentences. Viruses may undergo an inactivation.Logical formLearned from16 sentences. A virus can be recognized.Logical formLearned from16 sentences. A bunch can be constituted-of-or-filled-with viruses.Logical formLearned from16 sentences. A person may run (virus scans).Logical formLearned from16 sentences. Viruses can be a threat.Logical formLearned from16 sentences. A virus may be given.Logical formLearned from16 sentences. An outbreak may pertain-to a (flu virus).Logical formLearned from16 sentences. Risk can be for developping strains of a virus.Logical formLearned from16 sentences. A (vaccinia virus) can be modified.Logical formLearned from16 sentences. A virus may invade.Logical formLearned from16 sentences. A study may pertain-to a virus.Logical formLearned from16 sentences. A female may catch a virus.Logical formLearned from16 sentences. Susceptibility can be to a virus.Logical formLearned from16 sentences.