Ask the Harrisons if they know anyone infected.
From Create Your Own Story
"Not personally, no," Mrs. Harrison says quietly, sitting down on the couch. "But before the power went out, we saw a few on the television. Most of them were being quarantined in the hospital."
"They're not saying, but I'm guessing it's small pox." Mr. Harrison said, nodding his head.
"I don't think so," Mrs. Harrison said politely. "We've been over this, Alfred. Small pox doesn't exist anymore. It's all been erad-"
"Bah, you don't know what you're saying, woman. It could be a terrorist attack." Mr. Harrison rolls his eyes and shrugs.
You figure it's best to move on. These two may not be as friendly if you keep let them arguing.