Retroviruses may infect cells.Logical formLearned from2 sentences. (Pig viruses) may infect (xenograft recipients).Logical formLearned from2 sentences. Persons may be infected through a (blood system).Logical formLearned from2 sentences. A (network member) may infect others.Logical formLearned from2 sentences. A virus may infect astrocytes.Logical formLearned from2 sentences. Astrocytes may be infected with feline (immunodeficiency virus).Logical formLearned from2 sentences. Some genome may infect cells.Logical formLearned from2 sentences. (Zinc therapy) may be infected.Logical formLearned from2 sentences. Monkeys may be infected with simian (immunodeficiency virus).Logical formLearned from2 sentences. A proportion of (injection drug users) may be infected with hepatitis.Logical formLearned from2 sentences. Numbers of persons may be infected through heterosexual intercourse.Logical formLearned from2 sentences. Some percent of women may be infected by age.Logical formLearned from2 sentences. Persons may be infected in childhood.Logical formLearned from2 sentences. A person may infect co-workers.Logical formLearned from2 sentences. A person may be infected with a rootkit.Logical formLearned from2 sentences.