<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (July 2017) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (July 2017) (Learn how and when to remove this template message) </Td> </Tr> <P> Leonard Thompson (1908--1935) is the first person to have received injection of insulin as a treatment for Type 1 diabetes . </P> <P> Thompson received his first injection in Toronto, Ontario, on January 11, 1922, at 14 years of age . The first injection had an apparent impurity which was the likely cause for the allergic reaction he displayed . After a refined process was developed by James Collip to improve the canine pancreas extract, the second dosage was successfully delivered to the young patient twelve days after the first . </P>

When was the first person diagnosed with diabetes