A virus may infect millions of birds.Logical formLearned from6 sentences. Persons may be infected with hepatitis.Logical formLearned from6 sentences. Donors may be infected.Logical formLearned from6 sentences. A recipient may be infected.Logical formLearned from6 sentences. Persons may be infected with gonorrhea.Logical formLearned from6 sentences. Bats may be infected.Logical formLearned from6 sentences. One-third of a population may be infected with tuberculosis.Logical formLearned from6 sentences. Species may be infected.Logical formLearned from6 sentences. Persons may be infected in the past.Logical formLearned from6 sentences. Viruses may infect animals.Logical formLearned from6 sentences. Samples may be infected.Logical formLearned from6 sentences. Travelers may be infected.Logical formLearned from6 sentences. Persons may be infected with a disease.Logical formLearned from6 sentences. Some trees may be infected.Logical formLearned from6 sentences. A person may be infected with smallpox.Logical formLearned from6 sentences.