Across days 7–10 PI, Per1/2‐null TRF and Per1/2‐null all‐day fed infections peaked at a similar time to WT matched infections (mean phase hour GMT ± SD: WT matched = 17.71 ± 0.40, Per1/2‐null TRF = 18.43 ± 0.05, Per1/2‐null all‐day fed = 18.34 ± 0.18), but the peak of WT mismatched infections became 9 hours earlier (9.04h ± 0.89 GMT) between days 8 and 10 PI. The gene discussed is PER1; the disease is infection.