I did a little research. Hope is right, it appears that cenocepacia is the species that seems to reek the most havoc. The type your son has is compared to P. Aeuginosa. To date there are 9 genomically distinct species (Genomovar) which are known as the Burkholderia cepacia complex
1 B cepacia
2 B multivorans
3 B cenocepacia
4 B stabilis
5 B vietnamiensis
6 B dolosa
7 B ambifaria
8 B anthina
9 B pyrrocinia