"Unlike most previous outbreaks, which occurred in remote, localized spots, this one began in a border region where roads have been improved and people travel a lot. In this case, the disease was on the move before health officials even knew it had struck."
What if someone in a major US city got infected? How bad could it get? Could they even contain it at that point?
What if someone in a major US city got infected? How bad could it get? Could they even contain it at that point?