A virus may infect a boy.Logical formLearned from9 sentences. A worm may infect computers.Logical formLearned from9 sentences. Tissue may be infected.Logical formLearned from9 sentences. Victims may be infected by contact.Logical formLearned from9 sentences. A computer may be infected by a virus.Logical formLearned from9 sentences. A fungus may infect leaves.Logical formLearned from9 sentences. Blankets may be infected with smallpox.Logical formLearned from9 sentences. Some persons may be infected with hiv/aids.Logical formLearned from9 sentences. Sheep may be infected with bse.Logical formLearned from9 sentences. A sheep may be infected with scrapie.Logical formLearned from9 sentences. A bone may be infected.Logical formLearned from9 sentences. Computers may be infected with viruses.Logical formLearned from9 sentences. Everybody may be infected.Logical formLearned from9 sentences. Some chickens may be infected.Logical formLearned from9 sentences. Foot may infect cows.Logical formLearned from9 sentences.