A virus may undergo an introduction.Logical formLearned from107 sentences. A person may be infected with a virus.Logical formLearned from106 sentences. A death can be from a virus.Logical formLearned from106 sentences. A vaccine can be for a virus.Logical formLearned from105 sentences. A virus may mutate to a form.Logical formLearned from105 sentences. Viruses can be nasty.Logical formLearned from103 sentences. A part may pertain-to a virus.Logical formLearned from102 sentences. Some deaths can be from a virus.Logical formLearned from102 sentences. Stocks may pertain-to a virus.Logical formLearned from101 sentences. Antibodies can be against a virus.Logical formLearned from101 sentences. Some persons may die of a virus.Logical formLearned from101 sentences. A (h5n1 virus) can be pathogenic.Logical formLearned from100 sentences. Viruses can be bacterial.Logical formLearned from100 sentences. A virus may jump to humans.Logical formLearned from100 sentences. A person may be exposed to a virus.Logical formLearned from99 sentences.