A virus may infect systems.Logical formLearned from2 sentences. A virus may infect programs.Logical formLearned from2 sentences. A computer may be infected with a (boot sector virus).Logical formLearned from2 sentences. A virus may infect a (boot sector).Logical formLearned from2 sentences. Some phones may be infected.Logical formLearned from2 sentences. A worm may infect files.Logical formLearned from2 sentences. A system may be infected by a worm.Logical formLearned from2 sentences. Files may be infected by viruses.Logical formLearned from2 sentences. A virus may infect mbrs.Logical formLearned from2 sentences. A virus may infect some diskettes.Logical formLearned from2 sentences. A (boot virus) may infect a hard drive.Logical formLearned from2 sentences. A document may be infected.Logical formLearned from2 sentences. Worm may infect machines.Logical formLearned from2 sentences. Virus may infect a computer.Logical formLearned from2 sentences. A system may be infected with a virus.Logical formLearned from2 sentences.