FX’s newest hit series, “The Strain,” from acclaimed director Guillermo del Toro and executive producer Carlton Cuse, has a warning for the general public: They may be infected with “The Strain.”

“The Strain Transformation” app is available as a free download in the iTunes and Google Play stores. Fans can discover what will happen when an ancient parasitic plague enters their system and transforms them into a monstrous vampire. From examination to diagnosis, they’ll see their transformation in seconds. The app enables the infected to quickly share photos of their results on Facebook and Twitter to inform and warn their friends of the spreading infection. It offers exclusive video and access to The Strain social media, including the official Strain Facebook and Twitter pages.

FX worked with the agency Neo-Pangea to execute the Transformation App experience.

“The Strain” is a high concept thriller that tells the story of Dr. Ephraim Goodweather (Corey Stoll), the head of the Center for Disease Control Canary Team in New York City. He and his team are called upon to investigate a mysterious viral outbreak with hallmarks of an ancient and evil strain of vampirism. As the strain spreads, Eph, his team, and an assembly of everyday New Yorkers, wage war for the fate of humanity itself.

The ensemble cast of “The Strain” stars Corey Stoll, Mia Maestro, Sean Astin, Kevin Durand, Natalie Brown, Jonathan Hyde, Richard Sammel, Robert Maillet, Jack Kesy, Ben Hyland, Miguel Gomez and David Bradley.