A virus may have an (incubation period) of some days.Logical formLearned from14 sentences. A virus may contain a gene.Logical formLearned from14 sentences. Some viruses may invade human cells.Logical formLearned from14 sentences. A virus may circulate.Logical formLearned from14 sentences. A virus may be released as a warning to (internet users).Logical formLearned from14 sentences. A fever may be caused by a virus.Logical formLearned from14 sentences. A virus may turn_up in (research monkeys).Logical formLearned from14 sentences. Research can be on virus.Logical formLearned from14 sentences. Some percent of a population may be infected with a virus.Logical formLearned from14 sentences. A virus may cause bleeding.Logical formLearned from14 sentences. A virus may continue a march.Logical formLearned from14 sentences. A man may test positive for a virus.Logical formLearned from14 sentences. A course may pertain-to a virus.Logical formLearned from14 sentences. A country may fight a virus.Logical formLearned from14 sentences. A strain of a virus may emerge in a continent.Logical formLearned from14 sentences.