The microscopic bundles of RNA, wrapped in spiky proteins, latch on to human cells, hijack them, use them as factories to replicate, and then leave them for dead. It’s a biological blitzkrieg—an invasion so swift and unexpected that the germs are free to jump from host to host with little interference.
Fast forward to the future. Now, when the prickly enemies invade the lungs, they slip past the human cells, unable to take hold. They’re marked for destruction, soon to be surrounded and eliminated. Though some escape through the airways, they confront the same defenses in their next target—if, that is, they can get anywhere near the human cells. There are so few people left to infect that the germs have nowhere to replicate, nowhere to survive.
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