Evil, by AEG, has three disease-related domains: Disease, Rot, and Plague.
Disease
Granted Power: Immunity to all natural diseases. In addition, you may add your spell-caster level to any saving throw against magical diseases.
1 - Curse Water, Tran - PHB 190
2 - Inflict Moderate Wounds, Nec - PHB 217
3 - Contagion, Nec - PHB 187
4 - Poison, Nec - PHB 236
5 - Slay Living, Nec - PHB 252
6 - Circle of Death, Nec - PHB 184
7 - Destruction, Nec - PHB 192
8 - Horrid Wilting, Nec - PHB 215
9 - Energy Drain, Nec - PHB 199
Plague
Granted Power: You are a living extension of disease and contagions. Wounds caused by your ray attacks fester with disease. Damage from your ray attack spells does not heal properly and requires magical healing. Without magical healing, these points (whether hit points or ability damage) heal at a rate of only 1 per day.
1 - Inflict Light Wounds, Nec - PHB 217
2 - Summon Swarm, Con - PHB 261
3 - Contagion, Nec - PHB 187
4 - Enervation, Nec - PHB 199
5 - Insect Plague, Con - PHB 217
6 - Harm, Nec - PHB 212
7 - Creeping Doom, Con - PHB 190
8 - Finger of Death, Nec - PHB 203
9 - Energy Drain, Nec - PHB 199
Rot
Granted Power: Wounds fester with disease and puss from your touch. You are a living extension of disease and contagions. Touch attack spells that deal damage do not heal properly from you and require magical healing only. These points (whether hit points or ability damage) otherwise heal at 1 per day, no matter the level of the target creature.
1 - Inflict Light Wounds, Nec - PHB 217
2 - Death Knell, Nec - PHB 191
3 - Vampiric Touch, Nec - PHB 268
4 - Poison, Nec - PHB 236
5 - Slay Living, Nec - PHB 252
6 - Disintegrate, Tran - PHB 195
7 - Power Word, Stun, Con - PHB 237
8 - Horrid Wilting, Nec - PHB 215
9 - Soul Bind, Nec - PHB 254
Also, there is a Pestilence Prestige Domain in Defenders of the Faith.
Pestilence
Granted Power: Immunity to the effects of all diseases, though clerics with this power can still carry infectious diseases.
1 - Doom, Ench - PHB 198
2 - Summon Monster II, Con - PHB 258
3 - Contagion, Nec - PHB 187
4 - Poison, Nec - PHB 236
5 - Plague of Rats, Con - Def 88
6 - Curse of Lycanthropy, Nec - Def 84
7 - Scourge, Nec - Def 89
8 - Create Greater Undead, Nec - PHB 189
9 - Otyugh Swarm, Con - Def 88
Information taken from Black Falcon Aerie: http://www.wku.edu/~charles/rpgs/d&d/