I dont know if this has been posted i saw a thread about getting dna as much as you want at this point. But anyways to get the dna you have to become feverish and explode and that can take quite a bit of time but when you become feverish you can just jump off of your fleet into open space and instantly get your dna from dying. Then you can wait in your group on fleet and get infected again become feverish kill yourself and repeat until your happy. Ive done this a few times and its only taken me around 5-10 mins to get the dna. These also sell on my server anywhere from 10-15k a peice.
Hope this helps!