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Kidd was the oldest of the eight children of Dr Joseph Kidd and his first wife Sophia McKern. Like his father, he became an eminent London doctor. Two of his four brothers—Walter Aubrey Kidd (1852–1929) and Leonard Joseph Kidd (1858–1926) -- also became doctors; a third brother died young, while still training to become one.
Percy was educated at Uppingham School under Edward Thring, where he excelled at sports, becoming Captain of the cricket XI and Athletic Champion in 1869; and at Balliol College, Oxford, where he got a First Class degree. He then trained at St Bartholomew's Hospital, under Dr Samuel Gee and Dr John Wickham Legg; in 1885 he was Elected Fellow of the Royal College of Physicians, London, and by 1879 he was assistant physician and pathologist to the City of London Hospital. In 1881 he married Gertude Eleanor Harrison (1855–1940), and they had four children, including Leslie Kidd
He specialised in conditions of the chest, and was the author of A Contribution to the Pathology of Hæmophilia (London, 1878) and The Lumleian Lectures on Some Moot Points in the Pathology and Clinical History of Pneumonia (London, 1912). In 1918 he delivered the Harveian Oration On the Doctrine of Consumption in Harvey's Time and Today
Kidd made one first-class appearance playing cricket for Kent, in 1874, against Gentlemen of Marylebone Cricket Club. In the two innings in which he batted, he scored two ducks, and from eleven overs of bowling, he produced an analysis of 0-36.
- ‘KIDD, Percy M.’, Who Was Who, A & C Black, 1920–2007; online edn, Oxford University Press, Dec 2007 http://www.ukwhoswho.com/view/article/oupww/whowaswho/U227748, accessed 28 Sept 2008
- Percy Kidd at Cricket Archive