In the third Psi Corps novel, it is inferred that the telepath virus created by Edgars was eventually used in the war. Bester ended up having to take the drug that counteracts it.
Actually that isn't what's
implied.
The virus developed by Edgars is 100% contagious and 100% fatal if left untreated. The disease that Bester has is exceedingly rare and is treated by an exotic, but still commercially produced, drug. If Bester had the "Edgars virus" he would give it to every Teep he came into contact with (and maybe every normal as well, which would not affect them but would allow them to spread it to every teep
they met.) There would be millions of Teeps infected, most of them dying before their condition was even diagnosed. The "Edgards virus" kills within days if the antidote isn't take. Bester's condition requires a once-a-month shot, and even then there would be a period of probably weeks between the on-set of symptoms and death.
Bester's disease seems to be a result of Psi Corps experiments to produce a super teep - a continuation of the research that produced Jason Ironheart. It is possible that Psi Corps scientists adapted elements of the Edgards Virus in pursuing their goals, because there are clear signs that the condition originated from an artificial, perhaps even alien, source. But it is not the original disease developed by Edgars by any means.
We have yet to hear about the Mundane vs Teep War (which may take place long after Garibaldi and Lyta have gone to dust).
Or which may never take place. The teep gene is a delicate one, being an artificial creation of the Vorlons and not the natural result of evolution. With Psi Corps gone and its total control over teeps lives (and reproduction) a thing of the past, it is quite possible that talent will gradually be bred out of the Human gene pool, existing only in recessive form and never manifesting itself. Within a few hundred years, telepathy could be as impossible among the Humans as among the Narn.
More likely is sleepy's suggestion, that a technological solution is found to balance the teep's advantages - at least until such time as further technological advances allow every Human to be born telepathic - perhaps when we are closer to the First One-like, encountered suited form we see in "Deconstruction". There is good reason to believe that
all telepathy is artificial. Creatures who develop telepathy before intelligence might never need to develop spoken language, abstract thought or tools or weapons, all of which seem to be both products of intelligence and spurs to develop greater intelligence. If we could immediately feel one another's emotional state, needs, wants, desires and intentions, we would not need language. If we could touch and influence the minds of lower animals we would not need weapons to defend ourselves from them, and if they still served as our food we could either paralyze them with a thought or get them to run off a cliff to save us the bother of killing them. No need for cooperative hunting skills, planning, communication, or any of the higher brain functions. And it seems unlikely that telepathy would develop among creatures who already
had language and abstract thought. Mutant traits rarely develop full-blown. The earliest proto-telepathic abilities would probably be weak, unfocused and difficult to control. Therefore they wouldn't confer enough of a meaningful survival or reproductive advantage to take root in the population and continue to evolve. (The short story "The Nautilus Story" establishes that this is exactly the case in the
B5 universe.) So it seems that the Vorlons "invented" telepathy as an external system and eventually incorporated it at the genetic level. Perhaps we will do the same, forever removing the distinction between "mundane" and "teep"
Regards,
Joe