: I suppose its possible that there were some samples of the virus left over in
: S'pht labs or something. The S'pht may have been aware of this, and told
: Blake about it. The Pfhor seemed to have pretty much left Lh'owon alone
: after the conquest, so they could've easily overlooked it.
Perhaps because the S'pht were destroyed before they could turn off the bioengineering device, the lab was still producing the virus.
Also to answer Forrest's question, possibly the virus could only be contracted by the hidden-below-ground bioengineering device teleporting the virus directly into the host. It would figure the S'pht scientists would develop a high tech disease vector, one that did not have to depend on the unreliable weaknesses, variables and randomness of manual transmission.