It could be parasitic.
Or 'contrabiotic', which is a new term I just made up for an ecological relationship where neither partner benefits.
(
The Alchemist king of the needlessly complicated,
Wed 19 Aug 2009, 19:01,
archived)
Symbiotic is a happy word.
(
Ttssattsr,
Wed 19 Aug 2009, 19:04,
archived)
All smiles until the symbiot dies and its rotting corpse poisons the host.
(
Mu Dinofiddler,
Wed 19 Aug 2009, 19:05,
archived)