Projection of the relative abundances of bacterial taxa into the first and second principal components in sampled bees, together with correlation vectors representing variables driving the separation on both axes. (A) Bees sampled from the early-exposure group at days 5, 10, 15, and 20 after the start of treatment. (B) Bees sampled from the late-exposure group at days 5, 10, and 15 after the start of treatment. Ba, Bartonella; Bi, Bifidobacterium; Co, Commensalibacter; En, environmental bacteria; Fr, Frischella; Gi, Gilliamella; F4, Lactobacillus Firm-4; F5, Lactobacillus Firm-5; Sn, Snodgrassella.