Is Dannon the only company that produces Bifidus regularis?
Q. “Bifidus regularis” is the trademarked name for a strain of the bacterium Bifidobacterium animalis. Dannon’s trademarks for this particular strain of the bacterium include, according to a Romanian contributor to Wikipedia, Bifidus Digestivum (UK), Bifidus Regularis (US and Mexico), Bifidobacterium Lactis or B.L. Regularis (Canada), Dan Regularis (Brazil) and Bifidus Actiregularis (Argentina, Austria, Chile, Germany, Italy, Netherlands, Romania and Russia). The species of bacteria is produced by a Danish company that also trademarks strains of the species in countries where Dannon does not sell its yogurt. So the answer to the question is yes, but bacteria of the same species are available in other yogurts.
