Strain may pertain-to a (bird flu virus).Logical formLearned from11 sentences. A virus can be malignant.Logical formLearned from11 sentences. A (parvo virus) can be feline.Logical formLearned from11 sentences. A virus can be hypothetical.Logical formLearned from11 sentences. Viruses may affect humans.Logical formLearned from11 sentences. A virus may kill humans.Logical formLearned from11 sentences. Viruses may pertain-to a mind.Logical formLearned from11 sentences. A virus may evade an immune system.Logical formLearned from11 sentences. A prevalence may pertain-to viruses.Logical formLearned from11 sentences. Patients may be exposed to a virus.Logical formLearned from11 sentences. Viruses can be selected.Logical formLearned from11 sentences. An amount of virus may increase.Logical formLearned from11 sentences. A virus can be prolific.Logical formLearned from11 sentences. A virus may infect a cell.Logical formLearned from11 sentences. A virus may cause encephalitis.Logical formLearned from11 sentences.