Mars is teeming with zombies! See Ghosts of Mars.

There's already a Mars zombie movie sort of, with Liev Shrieber called the Last Days on Mars. I thought it was pretty good.

What about '28 decades later' set on Mars? Watching the infected chase Matt Damon and ruin his potato farm would be awesome

Well then, it's settled; Vermont is the place to go during a Zombie/ Virus apocalypse. Lol

The best beer is from Vermont. Plus it's beautiful and has wonderful people. That is more than most states can claim. BTWI am not from Vermont.

What about Vermont? Nothing ever happens in Vermont.
"Delaware. YeahDelaware". (excerpt from Wayne's World)

There's an underground tunnel between England and France. It is called "Channel Tunnel".
But this movie ending was hinting for Andy, who was carring the virus and was immune to it.

Ok thanks Wild T, you caught a lot more than I did. Thanks a lot. I'll watch it again with all that in mind.

Remember that Tammy also has the immunity
Not sure about this. She doesn't have the two-colored eye condition and only Andy was infected, as if to prove that only he has the immunity somehow through that bizarre trait.
As for how it got started in France, yes the mess in the crashed helicopter does suggest to me, also, that it started from there. For instance, the pilot didn't even turn off his radio (odd that it would still be on, and receiving, after all those days though).
I picture the following scenario (sorry for the bearer of bad news):
As they cross the English Channel, I don't see Flynn coming in contact with Andy, the carrier. BUT, big sister Tammy is not up on all that epidemiological stuff. I see her doing that thing that big sister's do: With some time finally to relax, she sees the smudge of blood on l'il bro's cheek, licks her thumb, wipes it partly clean with her thumb, then licks her thumb again, then whoops!
I'd say that poor Tammy is Europe's Patient Zero, that Andy doesn't make it out of the chopper alive, and Flynn the pilot most certainly didn't get out of his seat without being infected.
As for the OP's 28 months and years thing, this whole tragedy is going to get faster, not slower. I'd say we could go 28 Hours Later and 28 Minutes Later for parts 3 and 4.

How in the world did they get to Paris?
You might recall that Andy was infected when he was bitten by his Dad in the Underground. However, Andy didn't turn because he has the same immunity as his Mom.
Flynn didn't know that Andy was a carrier, so he flew across the Strait of Dover to France. Then, after they reached France, Flynn was infected by Andy and turned. We can infer this because we see the abandoned helicopter with signs of a struggle (i.e. equipment strewn around, Flynn's family picture crumpled up, etc.). So, that's how the Rage got to France.
Are they going to make a sequal?
I always thought that they could have made a sequel showing what happened to Andy and Tammy. Remember that Tammy also has the immunity. So, both of them could still be in France, trying to survive.
But, it's too late for that now because more than nine years has passed and Mackintosh Muggleton (the actor who played Andy) is now 22 years old!

How in the world did they get to Paris? Anyone on a plane or boat to cross the channel would know if there was an infected on board as it takes a few seconds to turn. Are they going to make a sequal? These were both great movies in my opinion! You can't even tell Rose Byrne is a Britt and she's great in Damages too! so hot.

No offence to Americans but
28
is made for England.
There's such a bleakness to it - even though it's a horror, it feels closer to
East Is East
or
Trainspotting
or
This Is England
than to any American zombie horror.
Not to mention the unforgettable scenes of deserted London, which will always be my favourite bit as a London.

Would Texas be any better? LOL

Why New Orleans and Miami? They're pretty much underwater so in 28 years they may not even exist