The surface area of a typical human lung is about the size of half a tennis court. So if a virus is capable of infecting those cells, that's a lot of cells that it can infect. That's why we model the lung. It's where the space is. And so we model the virus, not as specific agents. We sort of model clouds of virus. There's so much virus. You wouldn't want to model each individual one. The immune system is very complex. If you're interested in what the most complex of complex systems, I nominate the immune system to be that.

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