I'm reading a collection of W.W.2 diaries, in which it is reported (in 1944) that Mr. Churchill has pneumonia and is being treated with M. and B. Has anyone any idea what this was?
There was (is) a pharmaceutical company called May and Baker which produced antibiotics during the 1940s and the first ones were known by the initals of the company. If you Google May and Baker you will probably find out more.
"The precursors of antibiotics were Prontosil (Bayer), claimed to be effective in urinary infections in the late Thirties, followed by May and Baker (M&B) sulphonomides, which revolutionised the outlook in lobar pneumonia; then came penicillin and the rest."