A carrier may be infected.Logical formLearned from3 sentences. Some percent of a population may be infected by a virus.Logical formLearned from3 sentences. An (airline passenger) may be infected with a (bird flu virus).Logical formLearned from3 sentences. Migratory birds may be infected with a (flu virus).Logical formLearned from3 sentences. Children may be infected as a result of hygiene.Logical formLearned from3 sentences. Hens may be infected.Logical formLearned from3 sentences. A virus may infect some children.Logical formLearned from3 sentences. An outbreak may infect some children.Logical formLearned from3 sentences. Some fowl may be infected with (bird flu).Logical formLearned from3 sentences. Women may be infected at a rate.Logical formLearned from3 sentences. A bacterium may infect a fluid.Logical formLearned from3 sentences. A virus may infect some youngsters.Logical formLearned from3 sentences. Players may be infected.Logical formLearned from3 sentences. A germ may infect everyone.Logical formLearned from3 sentences. Animals may be infected through contact.Logical formLearned from3 sentences.