cure other people's diseases

This adds a 1st-level restoration spell with a cost of 0 that can cure diseases of others on target within a 15-foot radius. It's cast as a non-hostile spell and doesn't require line of sight (if you cast it directly on a follower in front of you, it should also hit a follower behind you, although your best option is to cast it individually on each of them, including mounts.

Darklocq Cure other people's disease spells (non-zone player healing version based on GovnoWriter)

This adds a 1st-level restorative spell with a cost of 1 that can cure diseases of others on target within a 15-foot radius. It's cast as a non-hostile spell and doesn't require line of sight (if you cast it directly on a follower in front of the follower, it should also hit a follower behind you, although your best bet is to cast it on each follower individually to make sure they (including mounts) do so (especially if you've just been fighting a bunch of vampires, outlaws, or other disease carriers).

Why? Skyrim (like previous TES games) actually offers NPCs and even horses to capture diseases (silently - you won't know anything about it unless you're very observant or use a console to check their stats). However, unlike previous games, Skyrim doesn't offer a practical way to cure them. They will permanently suppress stats forever (with more different stat suppresses appearing over time as they "collect" more diseases).

The best we could do in the past was to put cure-a-disease potions into NPCs' inventories and keep them away from other food and drink long enough that they couldn't be consumed. Even then, this doesn't work on horses, nor on companions/followers under various NPC overhaul mods (which often renders them unable to eat/drink what they're carrying).

What's worse, though: Skyrim, unlike Oblivion and Morrowind, no longer allows NPCs to actually drink edibles from their inventories. So the old "give them a useful Mickey Mouse Slide" move doesn't even work in this game!

Another mod option is Ghhost's Cure Disease Amulet, but even with the horse equipment mod, you can't make a horse wear the amulet.

I think this is fair and balanced as it fixes bugs that NPCs can't cure. This is a utility for players with followers, but otherwise has no gameplay effect (unlike the cure myself disease spell).

where to get spells

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The original book of its spells is located on a table in one of the rooms at the Sleeping Giant Inn in Riverwood, so you can get it as soon as you start the game. If you have GovnoWriter's Cure Disease Spells mod installed (for self-healing), this would be a close second in my book. Warning: While my book is freely available, his is owned by the innkeeper and you can receive a bounty if you witness his taking.

[not very] technical description

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Like the original "Contact/Target Cure Disease" effect in Morrowind, you can't use it preemptively to heal enemies so they can't infect you. Diseases are actually transferred via touch spell effects, rather than simply spreading (which is why you can't actually infect those around you by catching a disease; you lack the spell effect for disease spreading, although that might be an interesting mode in itself).

Install

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Install using your favorite mod manager, or just drag the ESP into the Data folder.

Overhauls of the magic system or skill (in this case "restoration") system should be preceded by this and similar individual spell add-on mods, unless specifically stated otherwise in their documentation.

From Ver. Upgrade 1.1

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Removed "CureDiseaseSpell.esp"; for clarity, the mod is now named CureDiseasesOfOthersSpell.esp to avoid conflict with Govnowriter's original mod.

Self-healing (other MODs)