Burkholderia cepacian is intrinsically resistant to:

Ref. Robbins Pathology. 9th edition. Page. 300   Burkholderia. Features: Gram-negative opportunists found in moist environments like Pseudomonas. 
 Case infections in people with cystic fibrosis and immunocompromised patients 
(Burkholderia cepacia complex). 
 These are intrinsically resistant to PolyMyxin B Burkholderia pseudomallei causes melioidosis, an infectious disease endemic in 
Southeast Asia; it also causes localized infection as well as systemic (e.g., not just 
pneumonia).