If you haven’t seen this movie yet, then I recommend it to writers as an interesting piece of storytelling sans-protagonist. While it is the story of an outbreak of deadly flu from patient zero to ‘cure’, it lacks a single character driving the story (unless you want to call the germ the protagonist) and hasn’t got a standard story-structure.
It cobbles a narrative flow together from experiences of different people though their stories are mostly very detached from each other. Overall it’s an exploration of different things that would happen during such an outbreak.
That last point differentiates this film from many through-multiple-eyes stories because the view points are much fuzzier here.
Personally I found the lack of a protagonist a bit distancing, but it was interesting to watch.