A woman may be infected with a virus.Logical formLearned from49 sentences. A virus can be insidious.Logical formLearned from49 sentences. Mutations can be in a virus.Logical formLearned from49 sentences. A virus can be transmissible.Logical formLearned from49 sentences. Persons may have a virus.Logical formLearned from49 sentences. A virus may be spreaded through contact.Logical formLearned from49 sentences. A virus may pertain-to a family.Logical formLearned from48 sentences. A virus can be in a body.Logical formLearned from48 sentences. Residents may contract a virus.Logical formLearned from48 sentences. Samples may pertain-to a (bird flu virus).Logical formLearned from48 sentences. A person may catch a virus.Logical formLearned from48 sentences. A virus can be exotic.Logical formLearned from48 sentences. A (bird flu virus) may undergo a mutation.Logical formLearned from48 sentences. An (encephalitis virus) can be equine.Logical formLearned from47 sentences. A site can be free of viruses.Logical formLearned from47 sentences.