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发现卡介苗的两位功臣是法国细菌学家卡默德和介兰。两位科学家工作之余,来到巴黎郊外一家农场,看到农场里的玉米长得很矮,以为是缺肥料,便建议农场主多施肥料,而农场主笑了笑说:“不是的,先生们,这种玉米种子已经是十几代了,有些退化了。” 农场主的话使介兰和卡默德深受启发,他们俩人由玉米的退化联想到:如果把毒性强烈的结核杆菌,一代一代地定向培养下去的话,
The two heroes of the discovery of BCG are the French bacteriologists Carmead and Jensen. When the two scientists had gone to work, they came to a farm on the outskirts of Paris. They saw that the corn in the farm was short and thought it was a shortage of fertilizer. They suggested that the farmer should make more fertilizer, and the farmer smiled and said, "No, Gentlemen, this kind of corn seed has been more than a dozen generations, some of which have been degraded.” The words of the farmer inspired Kim Lan and Kamed. They both think of the degeneration of corn: , if it is cultivated from generation to generation,