King Arthur Flour is not an off-brand. It has been around for 230 years, longer than General Mills and Pillsbury. It is healthier and higher quality and usually sells at a 25% premium over Gold Medal.
General Mills had a flour recall earlier this year for potential salmonella.
Pillsbury had a flour recall for potential salmonella earlier this year and now a second one one due to possible e. coli.
Gold Medal recalled 250 tons of flour last January due to potential salmonella. Gold Medal also recalled 5000 tons in 2016.
Most of the medical problems seem to stem from people consuming raw dough. Cooking at adequate temperatures kills e. coli and salmonella.
FWIW, King Arthur obtained their wheat from Archer Daniels Midland, which informed King Arthur the wheat they supplied was linked to e. coli outbreaks. Queen Guinevere was most displeased.