Revisado por Abdulxoxo

The film's plot revolves an International Security Affairs agent who is betrayed and shot in the head while transporting a valuable asset to another country. After recovery, he realizes he doesn't have much time left so sets out to find his estranged brother and also meets up with a doctor willing to look into treatment for his condition. When his brother attempts to kidnap the doctor, they are forced to work together to stop the criminals from unleashing a disease on the world.

This film has a good cast and a bit likable characters, the plotline tho is subpar, the beginning is promising but the focus of the story totally move from being about a chemical virus to a story about two estranged brothers. It also gets melodrama in some places and features questionable editing decisions that hurt the film's pacing and overall story consistency, as well as the viewer's emotional bond with the characters. However, majority of the film is action-packed, it features all kinds of action sequences, be it, foot chases, gun shootouts, hand-to-hand combats, you name it. While some of them are well-choreographed and intense, the others are so clumsy and unrealistic. Moreover, the shaky camera-work and fast-cutting editing makes them headache-inducing at times.

Overall, Viral factor could've been better, if it spends time developing the characters, then maybe it would have leave an impact on the audience. Nevertheless, it's entertaining, and the performances are good; Jay Chou and Nicholas did well in the lead roles. The visuals and overall production value is spot-on.