Viruses can be well-known.Logical formLearned from22 sentences. A person can be a virus.Logical formLearned from22 sentences. Viruses may infect cells.Logical formLearned from22 sentences. Viruses may cause damage.Logical formLearned from22 sentences. A bird may carry a virus.Logical formLearned from22 sentences. Some cases can be constituted-of-or-filled-with (virus infection).Logical formLearned from22 sentences. Infection can be with human (immunodeficiency virus).Logical formLearned from22 sentences. Viruses can be rare.Logical formLearned from22 sentences. Viruses can be true.Logical formLearned from22 sentences. A history may pertain-to a virus.Logical formLearned from22 sentences. Viruses can be simple.Logical formLearned from22 sentences. A host can be constituted-of-or-filled-with viruses.Logical formLearned from22 sentences. A virus may acquire an ability.Logical formLearned from22 sentences. Concern can be about a virus.Logical formLearned from22 sentences. An (influenza virus) can be equine.Logical formLearned from22 sentences.