Bullshit...

I went to Stepnogorsk twice to supervise the test preparations.
It was less than two years since I'd left there for Moscow, but the
facility had expanded so much that it was almost unrecognizable.
After testing the weapon in explosive chambers, we applied it
to the monkeys. Every one of the twelve monkeys contracted the
virus. They were all dead within three weeks.
In early 1990, Marburg Variant U was ready for approval by
the Ministry of Defense.
Our scientist had found it more difficult to cultivate Ebola than
Marburg--they were not able to reach the necessary concentration-but by the end of 1990, the long-term problem of cultivation
had been solved and we were close to developing a new Ebola
weapon. Meanwhile, at Zagorsk (Sergiyev Posad) military scientists were putting the finishing touches on new Lassa fever and
monkey pox biological weapons