In 28 Days Later..., the soldiers are discussing that Rage is so infectious and manifests so quickly after infection (within seconds) that it couldn't have spread outside of Britain. However, in the beginning of the movie, Selena recounts to Jim that the last news reports they heard before the TV stations stopped transmitting mentioned that there had been cases in Paris and New York.
Were those reports false/misinformation?
After all, the effects of the virus do make it highly unlikely that an infected person could get off the island. Or is there some non-human transmission model (e.g. birds)?
I know it's just a movie, but maybe there is some "in-universe" explanation for this.