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The “Knocking on Wood” Wikipedia page mentions Roud’s conclusion, and this claim of a 19th century origin has circulated online as the final say on the matter. If you go back to the original, though, Roud’s proposal actually ends on an ambivalent note: “Before this theory [of 19th century origins] can be finally accepted, however, an examination of the history of European forms of this custom would be advisable.”
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Алексей Гусев (Редактор отдела «Спорт»)
协同上合组织各国共同应对、系统治理代谢性疾病难题，增进各国民生福祉，中国—上合组织代谢性疾病合作中心既是推动上合组织卫生健康赋能建设的重要引擎，更将是服务上合组织各国人民健康的民生工程。