Parts per Billion

Parts per Billion is a 2013 American romantic drama written and directed by Brian Horiuchi. It stars an ensemble cast comprising Frank Langella, Gena Rowlands, Rosario Dawson, Penn Badgley, Teresa Palmer, and Josh Hartnett as three loosely connected couples who must deal with a looming biological attack.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.