Here's why I think it would be very difficult for this virus to spread across the entire world; The infection occurs very quickly, and once you're infected, it's totally obvious (red eyes, bad attitude, vomiting blood, etc.). So initially it would spread fast, particularly in a city environment. But as soon as everyone realized what's going on, it would just become one big shooting gallery. I liked the movie because in the end, it was clear that the entire world was not infected.
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