A virus can be weakened.Logical formLearned from134 sentences. Strains can be constituted-of-or-filled-with virus.Logical formLearned from133 sentences. A virus can be airborne.Logical formLearned from133 sentences. Viruses may undergo a use.Logical formLearned from133 sentences. Signs may pertain-to a virus.Logical formLearned from132 sentences. A virus can be known.Logical formLearned from132 sentences. A virus can be in a us-state.Logical formLearned from131 sentences. A virus may infect some persons.Logical formLearned from131 sentences. A virus can be widespread.Logical formLearned from127 sentences. A virus can be alien.Logical formLearned from127 sentences. (Virus definitions) may pertain-to a person.Logical formLearned from126 sentences. A virus may spread.Logical formLearned from125 sentences. Viruses may undergo a detection.Logical formLearned from124 sentences. A female may contract a virus.Logical formLearned from122 sentences. A virus may circulate.Logical formLearned from122 sentences.