A virus may be isolated in a country.Logical formLearned from21 sentences. A chance may pertain-to a virus.Logical formLearned from21 sentences. A virus may cause a common cold.Logical formLearned from21 sentences. A country can be free of a virus.Logical formLearned from21 sentences. A virus may cause infections.Logical formLearned from20 sentences. Cases may pertain-to a (flu virus).Logical formLearned from20 sentences. A man may be diagnosed with a virus.Logical formLearned from20 sentences. (H5n1 viruses) can be pathogenic.Logical formLearned from20 sentences. A pathogenicity may pertain-to a virus.Logical formLearned from20 sentences. A (bird flu virus) can be fatal.Logical formLearned from20 sentences. A source can be constituted-of-or-filled-with virus.Logical formLearned from20 sentences. Chances may pertain-to a virus.Logical formLearned from20 sentences. Carriers can be constituted-of-or-filled-with virus.Logical formLearned from20 sentences. Virus may be transmitted by mosquitoes.Logical formLearned from20 sentences. Reports may pertain-to a virus.Logical formLearned from20 sentences.