dunno it remains a conundrum, but I tend to think a "virus" is the body response to a chemical toxin, an encapsulated toxin sort of thing, and being incredibly small cannot be "isolated" (no filter small enough), and if you did somehow and then reintroduced to a healthy host, it would not replicate the disease because the "virus" is the toxin safely encapsulated. So I suppose they were making toxins...
dunno it remains a conundrum, but I tend to think a "virus" is the body response to a chemical toxin, an encapsulated toxin sort of thing, and being incredibly small cannot be "isolated" (no filter small enough), and if you did somehow and then reintroduced to a healthy host, it would not replicate the disease because the "virus" is the toxin safely encapsulated. So I suppose they were making toxins...
but yeah it is not very clear to me either.
Ding! Read above.