“C.A.M.” (** out of four) was a derivative but somewhat diverting end-of-the-world suspense melodrama about a rare parasite that has contaminated a local meat processing plant which requires tactical police (Charlotte Curwood, Tom Ware, Jamie Langlands, and others) to be sent in but they soon realize they are dealing with something far worse that could have grave consequences on a worldwide scale. Yet another ripoff of “28 Days Later” and “Alien” but still it moves fast and keeps you relatively in its grip. Still, though, a little of this does go a long way even at 85 minutes. Title stands for Contagious Aggressive Mutations, not for camera.