PER1 and infection: Post‐peak model fits were generally poorer compared with pre‐peak model fits but suggest that period remained close to 24 hours in WT matched infections (23.34h), lengthened by 3 hours to reach approximately 24 hours in the WT mismatched group (24.04h), and infections in Per1/2‐null hosts also extended by 3–5 hours to exceed 24 hours (Per1/2‐null TRF =26.88h, Per1/2‐null all‐day fed =27.90h; Table 1; Figure S3).