Some children may be infected with a virus.Logical formLearned from36 sentences. A virus may be found in birds.Logical formLearned from36 sentences. A change can be in a virus.Logical formLearned from36 sentences. A virus may spread to humans.Logical formLearned from36 sentences. A virus may lead to a pandemic.Logical formLearned from36 sentences. A (bird flu virus) can be in a country.Logical formLearned from35 sentences. A virus may reach a country.Logical formLearned from35 sentences. Viruses may circulate.Logical formLearned from35 sentences. Access can be to a virus.Logical formLearned from35 sentences. A (smallpox virus) can be deadly.Logical formLearned from35 sentences. Virus may undergo concentration.Logical formLearned from35 sentences. A virus can be single-stranded.Logical formLearned from35 sentences. A virus may be knowned as flu.Logical formLearned from35 sentences. A virus may be contracted from a phone.Logical formLearned from35 sentences. A virus can be spotted.Logical formLearned from35 sentences.