Toxins and mobile antimicrobial resistance genes in Bacillus probiotics constitute a potential risk for One Health

[Display omitted] •The safety assessments of Bacillus probiotics used for human, animal, plant, aquaculture and environment were studied.•The presence of several types of bacterial toxins associating with infectious in certain groups were detected in some Bacillus probiotics.•The presence of mobile antimicrobial resistance genes in Bacillus probiotics indicates a potential threat to One Health.•The safety issues of Bacillus probiotics is not limited to China, but a global problem. Probiotic microbes conferring health benefits to the hosts have attracted great attention. However, the safety of probiotics is not guaranteed, although the increasing widespread use of probiotics with excellent overall safety records. Here, we performed a systematic evaluation of the safety of commercial Bacillus probiotics intended for usage in humans, animals, plants, aquaculture and environment in China. Nearly half of the 65 isolated Bacillus spp. strains from these commercial probiotic products were capable of producing hazardous toxins. Infections with the representative isolates could cause sepsis, intestinal inflammation and liver injury in different mouse models. Additionally, these isolates harbor multiple antimicrobial resistance genes coupled with mobile genetic elements. Collectively, the capability for producing various toxins and harboring mobile antimicrobial resistance genes in Bacillus probiotics indicates a potential risk for One Health.