Clearance may pertain-to a virus.Logical formLearned from12 sentences. Viruses can be malevolent.Logical formLearned from12 sentences. A virus may circulate among birds.Logical formLearned from12 sentences. Viruses can be widespread.Logical formLearned from12 sentences. Viruses can be contagious.Logical formLearned from12 sentences. A (laryngotracheitis virus) can be infectious.Logical formLearned from12 sentences. A campaign can be against a virus.Logical formLearned from12 sentences. Some countries may be hited by a virus.Logical formLearned from12 sentences. A virus may be transmitted by pigs.Logical formLearned from12 sentences. Characteristics may pertain-to a virus.Logical formLearned from12 sentences. A virus may spread throughout a country.Logical formLearned from12 sentences. Pneumonia may be caused by a virus.Logical formLearned from12 sentences. (Seed stock) may pertain-to a virus.Logical formLearned from12 sentences. Officials may describe a virus.Logical formLearned from12 sentences. Concern can be about injecting viruses.Logical formLearned from12 sentences.