A vaccine can be to a virus.Logical formLearned from12 sentences. An obstacle to creating a vaccine can be a genetic variability of a virus.Logical formLearned from12 sentences. Viruses can be a property of nations.Logical formLearned from12 sentences. Viruses may cause a common cold.Logical formLearned from12 sentences. Tests can be for viruses.Logical formLearned from12 sentences. Humans may catch a virus.Logical formLearned from12 sentences. Scientists may discover a virus.Logical formLearned from12 sentences. A virus can be detectable.Logical formLearned from12 sentences. A percent may pertain-to viruses.Logical formLearned from12 sentences. A woman may test positive for a virus.Logical formLearned from12 sentences. A virus may kill.Logical formLearned from12 sentences. Influenza may be caused by a virus.Logical formLearned from12 sentences. A child may carry a virus.Logical formLearned from12 sentences. Cervical cancer may be caused by a virus.Logical formLearned from12 sentences. A (kill rate) may pertain-to a virus.Logical formLearned from12 sentences.