When does The Strain return?

The Strain is an American horror drama television series that aired on FX from July 13, 2014, to September 17, 2017. It was created by Guillermo del Toro and Chuck Hogan, based on their novel trilogy of the same name. The show centers around Dr. Ephraim Goodweather, the head of the CDC's New York-based Canary Project, who is called upon to investigate an airplane landing wherein everyone aboard is dead. What his team discovers is a viral outbreak that has similarities to an ancient strain of vampirism.