13+ Health Benefits of Apple Cider Vinegar. 1  Your Brain on Trust: Why Weâre Hardwired to Rely On Others. 2  19 Easy Ways You Can Torch 200 Calories In a Blink of an Eye. 3  This Mom Lost Over 150 Pounds by Cutting Out 4 Foods.
O. volvulus is transmitted by sandflies, and their role in the transmission of onchocerciasis was discovered by the Scottish parasitologist Breadablane Blacklock in Sierra Leone in the mid-1920s (19). There are accounts of the history of onchocerciasis by Grove (105) and Muller (192).
Areas of research. Cause. Early research on the cause of cancer was summarized by Haddow in 1958. The first chemical carcinogen was identified in 1928-29 as 1:2-5:6-dibenzanthracene, and the carcinogeneic substance in pitch was identified as 3:4-benzopyrene in 1933.