Just to let you know, the codex entry Cathar Settlers on Taris is bugged as well. Everywhere I've looked the consensus is that it's bugged. No one has been able to find it but it still shows I'm missing one. Also, why does it only say 5/6 entries completed on Taris when I'm personally found more than a dozen? Is that categories completed? Also, if your still looking, the Rakghoul Disease entry is located in the hospital in the back of the research level. So it's not bugged, at least on the Republic side.