What military unit was Fleming a private in from 1900 to 1914?

From 1900 to 1914, Alexander Fleming was a private in the London Scottish Regiment.

Fleming joined the regiment’s rifle club while studying medicine. His skill as a marksman helped lead him toward research: the captain of the club wanted to keep him on the team and suggested that he join the research department at St Mary’s Hospital. There, Fleming became an assistant bacteriologist to Sir Almroth Wright.

Fleming remained a private in the London Scottish Regiment of the Volunteer Force until 1914. When the First World War began, he received a commission in the Royal Army Medical Corps, becoming a lieutenant in 1914 and a captain in 1917.

His wartime service was medically important as well as military. Fleming worked in battlefield hospitals on the Western Front, where he studied wound infections and helped demonstrate the limitations of antiseptic treatments. The Royal Scots Fusiliers, Gordon Highlanders and Black Watch were different Scottish military formations, not Fleming’s unit.