Due to unpopular demands after making the poison post here's the diseases. Not sure how useful it will be. And I was too lazy to check the scripts of some and deleted others >_>

Name First_Save Subs_Save Incubation Hours Blinding_Sickness | 16 | 16 | 1 | d4 of Str Damage Cackle_Fever | 16 | 16 | 1 | d6 of Wis Damage Demon_Fever | 18 | 18 | 1 | d6 of Con Damage Devil_Chills | 14 | 14 | 1 | d4 of Str Damage Filth_Fever | 12 | 12 | 1 | d3 of Int Damage d3 of Con Damage Mindfire | 12 | 12 | 1 | d4 of Int Damage Mummy_Rot | 20 | 20 | 1 | d6 of Con Damage Red_Ache | 15 | 15 | 1 | d6 of Str Damage Shakes | 13 | 13 | 1 | d6 of Str Damage Slimy_Doom | 14 | 14 | 1 | d4 of Dex Damage Ghoul_Rot | 18 | 18 | 1 | d6 of Con Damage d6 of Str Damage Zombie_Creep | 15 | 15 | 1 | d4 of Con Damage d4 of Dex Damage Dread_Blisters | 13 | 13 | 1 | d4 of Con Damage d4 of Cha Damage Burrow_Maggots | 17 | 17 | 1 | d4 of Int Damage d4 of Wis Damage Soldier_Shakes | 25 | 25 | 1 | Does.. something. Haven't checked the script Vermin_Madness | 13 | 13 | 1 | 1 Damage to Int, Wis and Cha

Now how about some prostitute npc's who have a chance to give someone a disease?

Eeewwwww! :P

For example do rats give specific diseases or is it random..? Also how should you roleplay symptoms. Having low health is roleplayed as bleeding but what about disease?

There are so many different sorts of diseases out there. Some of them attack your constitution, which may make you cough and hack. Some can affect your Wisdom, making you see spots and giving you a fever. Look at the attribute penalty, find an analogous real-life disease, and mimic the symptoms.

^^^ Suggestion ^^^

Are these modified versions of the ones implemented by Bioware, or the same thing? Thanks in advance :)

They look like the standard bio ones, unless he's added to them when I wasn't looking.