Patogener i Proteeae- gruppen (Proteus spp., Providencia spp. og Morganella spp.) er generelt mindre følsomme over for tigecyklin end andre medlemmer af Enterobacteriaceae.
Pathogens of the family Proteeae (Proteus spp., Providencia spp., and Morganella spp.) are generally less susceptible to tigecycline than other members of the Enterobacteriaceae.