Angela Vidal and her cameraman are making a documentary about the fire brigade. Joining up with a couple of them, called out to an apartment building, they soon discover something horrific is going on....
Quarantine is a an American remake of Rec. This means it has two major problems to overcome. First, Rec was to me the scariest movie I've seen in a cinema for almost 18 years (the last, was The Exorcist III)! The second, is that it IS an American horror movie remake. Now, the track record for this has been awful. Consider the evidence - The Ring, The Grudge, One Missed Call, The Wicker Man to name some. Hell, they can't even remake American movies! The Hitcher, When A Stranger Calls (I still shudder about that one!), Prom Night, Halloween. So this movie starts with two major points against it.
However, despite a couple of minor issues, and one major one, it's not that bad.
The reason it works, is that the director John Erick Dowdle has taken the scares from the original and simply re-done them. In fact the movie is almost a shot for shot remake of Rec! The fact that despite having seen Rec, the scares still work is a testament to not only how scary the original was, but also how well they've been re-done.
As I said, there are a couple of minor faults. Some of the make-up effects, don't quite work. The other minor fault is that the cast, while good aren't as convincing as the original cast were. Case in point, Jennifer Carpenter as Angela. At the start she's fine, but by the end she's a bit over the top in hysterical and terrified mode compared to Manuela Velasco.
But the major fault, and this one is harder to overlook is that they've changed what is actually going on. In this movie, it's suggested that it's a strand of rabies that has caused the outbreak. In the original, it's never really revealed what is causing it, although events towards the end suggest a possible supernatural cause. But because they've changed it here, it means the final scenes don't work as well, and don't really fit. And the final shot, which was revealed in the trailer by the way, again doesn't work in the remake.
The movie is slightly longer than the original, spending more time with the fireman at the station before the events begin, and has a little more emphasis on what is going on outside also, but these little changes don't affect the movie that much.
How you view this movie will depend on the original, Rec. If you've not seen the original then it is a pretty effective scary movie, especially the last 15 minutes. However if you've seen Rec, then this movie offers nothing new, and isn't as good overall.