Nick Day's interests include the epidemiology, diagnosis, pathophysiology, pathogen biology, treatment and prevention of malaria, rickettsial diseases including scrub typhus, melioidosis, leptospirosis, rickettsial infections, influenza, dengue and other communicable diseases afflicting rural populations throughout Asia and beyond. Cross-cutting interests include the drivers and epidemiology of AMR, and the syndromic management of febrile illnesses and sepsis in LMIC settings.