Still, could someone explain that whole diclonius looking into the mind of Kurama? What did they do to him? And why did he come an agent to stop them because of that? It looks like he can't or they won't kill him.
Unless I'm misintepreting everything, Lucy is the only one who can reproduce in the normal way humans do, she is the Queen, and we can assume she has been infecting lots of people across the country. Sterile diclonius, called Silpelit, can pass the virus too. From what the series has shown us, they jab one of their vectors into any human brain, and infect it with a virus. This virus ensures that all children from the infected are also sterile dicloniuses (dicloni?) Kurama and the other guy were both hit, and thus both had diclonius children.

The director said he was trying to track down the source of the virus, so that is how we can assume they captured and did all the things they did to Lucy.

Btw, is Nana a third generation diclonius? It appears that the "good" doctor killed all the third generations were born, but the second generations were the ones killing. Nana didn't want to kill everyone on instinct like the others did.
They said that 35 was the only 3rd generation they kept alive. But Nana was definitely a 3rd too... (Lucy, the one that infected Kurama, Nana) Either the scientist guy doesn't know Nana is still alive, which seems a little odd since he's releasing 35 to kill Nana (eps 9), or the "generations" don't work in the way we think they should.