FX has unveiled a pair of brief but undeniably creepy teasers for the second season of "The Strain," the horror series based on the bestselling vampire novels by Guillermo del Toro and Chuck Hogan.

The 10-second spots, titled "Can You Trust Her?" and "He Is You," feature seemingly normal people who, in a flash, are transformed into savage vampires. The accompanying text reads, "Your whole world can change in the matter of seconds" and "Can you tell who’s infected? It might be you."

When the first season came to a close in October, Abraham Setrakian (David Bradley), Dr. Ephraim Goodweather (Corey Stoll) & Co. were left at least temporarily defeated after their plan to kill the Master failed, even as the undead hunter Mr. Quinlan recruited Gus (Miguel Gomez) to join a parallel effort to destroy the ancient renegade vampire.

The 13-episode second season of The Strain premieres this summer.