An increase can be in (flu cases).Logical formLearned from11 sentences. An upsurge can be in (bird flu outbreaks).Logical formLearned from11 sentences. A (flu strain) may undergo a transmission.Logical formLearned from11 sentences. (Bird flu virus) may undergo an infection.Logical formLearned from11 sentences. Access can be to (bird flu vaccines).Logical formLearned from11 sentences. (Bird flu viruses) may be shared with a global community.Logical formLearned from11 sentences. A (bird flu outbreak) can be among poultry.Logical formLearned from11 sentences. (Bird flu) may kill some chickens.Logical formLearned from11 sentences. A (bird flu virus) can be mutate into a strain.Logical formLearned from11 sentences. (Bird flu) can be a threat.Logical formLearned from11 sentences. (Winter flu shots) can be regular.Logical formLearned from11 sentences. A country may record cases of (bird flu).Logical formLearned from11 sentences. Tests may detect (bird flu).Logical formLearned from11 sentences. A pandemic may be caused by (bird flu).Logical formLearned from11 sentences. A hospital can be with (flu symptoms).Logical formLearned from11 sentences.