A few CFS from L. vaginalis turned to inhibit dimorphic switching (2 out of 12, corresponding to 17%, for pk-CFS and 1 out of 12, corresponding to 8%, for bf-CFS) while for L. plantarum species pk-CFS were active in 5 out of 12 cases (42%) and bf-CFS in 7 out of 12 cases (58%), resembling L. crispatus CFS behavior. The gene discussed is CFB; the disease is myalgic encephalomeyelitis/chronic fatigue syndrome.