A virus may infect persons by an end of a week.Logical formLearned from2 sentences. A boy may be infected with a strain.Logical formLearned from2 sentences. An (animal virus strain) may infect persons.Logical formLearned from2 sentences. Pig may infect some persons.Logical formLearned from2 sentences. A female may be infected with a strain of a (bird flu virus).Logical formLearned from2 sentences. Persons may be infected with some tuberculosis.Logical formLearned from2 sentences. A researcher may be infected with a virus.Logical formLearned from2 sentences. A (flu virus) may infect a quarter of a population.Logical formLearned from2 sentences. Bacteria may infect others.Logical formLearned from2 sentences. A girl may be infected with a (bird flu virus).Logical formLearned from2 sentences. A gloom may infect everyone.Logical formLearned from2 sentences. A crisis may infect (stock markets).Logical formLearned from2 sentences. Problems may infect the economy.Logical formLearned from2 sentences. A testimony may infect persons.Logical formLearned from2 sentences. Birds may be infected in some markets.Logical formLearned from2 sentences.