A person may test positive for a virus.Logical formLearned from25 sentences. A virus can be in humans.Logical formLearned from25 sentences. A virus may be confirmed in a country.Logical formLearned from25 sentences. A percent may pertain-to a virus.Logical formLearned from25 sentences. A virus may kill millions.Logical formLearned from25 sentences. A virus may hit a country.Logical formLearned from25 sentences. Some persons may be exposed to a virus.Logical formLearned from24 sentences. A control may pertain-to a virus.Logical formLearned from24 sentences. A spread may pertain-to a (killer virus).Logical formLearned from24 sentences. Signs can be constituted-of-or-filled-with virus.Logical formLearned from24 sentences. (Virus infection) may undergo a prevention.Logical formLearned from24 sentences. Humans may be infected with a virus.Logical formLearned from24 sentences. Millions can be constituted-of-or-filled-with viruses.Logical formLearned from24 sentences. Response can be to a virus.Logical formLearned from24 sentences. A body may fight a virus.Logical formLearned from24 sentences.