What's with the butterflies in: I Am Legend?

[HalfwayHandsome]

Never could figure it out. Plus wtf happend that caused humans to turn into zombies?

 

[Deezay]

......just...Google it.
Did you pay attention at all?

 

[klientel]

Never could figure it out. Plus wtf happend that caused humans to turn into zombies?

bruh the entire movies was about that....

how did u miss it?

Spoiler

somebody created a cure for cancer that mutated and turned everybody into those things

 

[newarkhiphop]

there supposed to be making a prequel to it