Advertisement Yesterday I discovered two of my Harpactira caffreriana slings show symptoms of "DKS". Since that term is widely overused I will for the rest of the post stick with more descriptive terms. Both slings show diskinetic and moreover hyperkinetic movements. The movement looks exactly like the spider @Tomoran showed here. One sling is more affected and not able to coordinate its movement at all, the other managed a recognizable threat posture at least. Both slings have been rehoused a few weeks ago and the third, slower growing sling that I haven't rehoused yet doesn't show symptoms. Easy solution, right? New enclosures or substrate are to blame... Not so fast. A few shelves over and with at least 20 other enclosures in between one of my T. cyaneolum juveniles is showing diskinetic and hyperkinetic movements, too, although less severe. She hadn't been rehoused lately. Of course, I'm desperately trying to figure out what went wrong and how I can save my spiders. I did rehouse all three affected spiders immediately on the off chance that it actually was someting in the enclosures, although several things are speaking against it: I have rehoused other spiders (N. incei juveniles) and they are doing fine - well, 1 out of 5 hasn't taken its food yesterday and you can believe I'm watching that one very closely, but it hasn't shown any sign of abnormal movement. Substrate, cork bark and fake plants from the same batch as in the affected enclosures has been used elsewhere without problems. I think I missed the onset of the symptoms in the H. caffreriana slings since they had stayed hidden since the the rehouse and the worse affected one hadn't taken it's food for the last two weeks which actually was the thing that made me suspicious. The T. cyanoneolum was slow in tackling it's prey last week but the symptoms are only visible this week. So far for the description of the situation. Now onto possible causes: 1. Poisoning. Everyone always points to that possibility. There are several things that make that unlikely here, though: a. I cannot think of any poison I could have used anywhere around them. From outside? Who sprays pesticides in the middle of winter? b. Only 3 spiders in a shelving unit with over 100 seem to be affected as of now. 2. This post: This was the only scientific evaluation of the problem I could find. For some strange reason it doesn't get cited more often. So here we have a bacterial bowel infection and Microsporidia, a parasitic single cell fungus that mainly affects Arthropods. If that is the reason: a. It could spread b. the infected spiders would have a chance of survival, though. Every infection can be beaten. Did I miss something? Does anyone have any extra information, preferably something scientific? Can someone please tell me about spiders that survived??? PLEASE???