A virus can be adept at spreading among humans.Logical formLearned from21 sentences. Visitors may show symptoms of a virus.Logical formLearned from21 sentences. A virus may remain difficult.Logical formLearned from21 sentences. A virus may be found in chickens.Logical formLearned from21 sentences. Persons may deal with a virus.Logical formLearned from21 sentences. Children may be infected with a virus.Logical formLearned from21 sentences. Antibiotics may kill viruses.Logical formLearned from21 sentences. A virus may infect a cell.Logical formLearned from21 sentences. Scientists may identify a virus.Logical formLearned from21 sentences. A vaccine may contain a virus.Logical formLearned from21 sentences. Pregnant women may be infected with a virus.Logical formLearned from21 sentences. A virus may cause flu.Logical formLearned from21 sentences. An equestrian team may battle_back from (equine virus outbreak).Logical formLearned from21 sentences. A virus can be harmless.Logical formLearned from21 sentences. Fears can be about a spread of a virus.Logical formLearned from21 sentences.