A (flu season) may pertain-to a winter.Logical formLearned from27 sentences. A vaccine may protect against flu.Logical formLearned from27 sentences. A (bird flu strain) can be lethal.Logical formLearned from27 sentences. A country may confirm some cases of (bird flu).Logical formLearned from27 sentences. Concerns can be about avian flu.Logical formLearned from27 sentences. A (flu shot) may think.Logical formLearned from27 sentences. A (flu case) may pertain-to a country.Logical formLearned from26 sentences. A (flu case) can be confirmed.Logical formLearned from26 sentences. A (flu virus) can be in a country.Logical formLearned from26 sentences. A (bird flu patient) may pertain-to a country.Logical formLearned from26 sentences. A form can be constituted-of-or-filled-with avian flu.Logical formLearned from26 sentences. A (flu vaccination) can be seasonal.Logical formLearned from26 sentences. A (bird flu outbreak) can be in a continent.Logical formLearned from26 sentences. A person can be over a flu.Logical formLearned from26 sentences. A resurgence can be constituted-of-or-filled-with flu.Logical formLearned from26 sentences.