Some birds may be infected with a strain.Logical formLearned from2 sentences. Some humans may be infected with (bird flu).Logical formLearned from2 sentences. Week may be infected with a (bird flu virus).Logical formLearned from2 sentences. Nation may be infected.Logical formLearned from2 sentences. Animals may be infected by migratory birds.Logical formLearned from2 sentences. A wild duck may be infected with a strain of a virus.Logical formLearned from2 sentences. Samples may be infected with a virus.Logical formLearned from2 sentences. Birds may be infected with (bird flu).Logical formLearned from2 sentences. An outbreak of a disease may infect (farm workers).Logical formLearned from2 sentences. (Poultry flocks) may be infected in northern states.Logical formLearned from2 sentences. States may be infected.Logical formLearned from2 sentences. States may be infected by an outbreak of a strain of (bird flu).Logical formLearned from2 sentences. Locations may be infected.Logical formLearned from2 sentences. A virus may be detected before infecting poultry.Logical formLearned from2 sentences. Ducks may be infected with a strain of (bird flu).Logical formLearned from2 sentences.