Originally Posted by Andy M.
Could this be it?
Andy, I wondered about that too.
"Some people believe that if the honey is pasteurized it will be safe to give to infants. Nothing could be further from the truth. Pasteurization does nothing to botulism spores. Nothing."
From Does pasteurization of honey kill Clostridium botulinum? | Honey Bee Suite
And, "The nonproteolytic B, E and F strains can grow at refrigerated temperatures, but produce spores of very low heat resistance. These types cause problems primarily in pasteurized or unheated foods..."
From WHO | Botulism