Final answer:
Based on the information provided, the person is at risk of developing chickenpox rather than smallpox.
Step-by-step explanation:
Based on the information provided, it is more likely that the person is at risk of developing chickenpox rather than smallpox. Chickenpox is caused by the varicella-zoster virus, which is a member of the herpesvirus family. It is a common childhood disease characterized by the formation of pustular lesions on the trunk. Smallpox, on the other hand, is a highly contagious and severe disease caused by the variola virus, which has been eradicated since the 1980s.