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It was successfully used to treat Winston Churchill's bacterial pneumonia in 1942. In a subsequent radio broadcast he said: "This admirable M&B from which I did not suffer any inconvenience, was used at the earliest moment and, after a week's fever, the intruders were repulsed." This quote is attributed to Churchill's time in Tunis while visiting General Eisenhower's headquarters in December of 1943.**
In 1944 M&B 693 also saved Nero, the Royal Circus lion, from pneumonia. [Glasgow Evening News January 1944.]