 He also was a consultant in tuberculosis to the Republic of Korea, Department of Health and Social Affairs, from 1961-1963.After receiving his diploma in tropical medicine and hygiene from the London School of Tropical Medicine in 1925, Struthers returned to the Cheeloo University and began to also study tropical and parasitic diseases.Specifically, Struthers became a leading researcher on kala-azar (leishmaniasis), a disease transmitted by sandflies which is caused by a parasite invading the blood-forming organs.