How to switch off the vampire pack in sims 4

@ElisabethLudvig I am in the same boat as you... I didn't get the Vampires pack until recently - and I build a lot so I got it for building items. I went through all of the households first thing and deleted apparent vampires/households, and I plan to do so if I become aware of any other ones. Apparently you can grow garlic so that will be my next step. I will add one or two planters of it by the doors. I will also be making and adding a garlic wreath/braid at the doors. Apparently there are other similar manners of protection, you can lock your outside doors plus bedroom doors, and don't answer or invite them in if they come to the door.
Also...

• There is no ability to turn vampires off in the game by a toggle off or settings option. Apparently there is a Mod that will turn them off, but I don't use Mods. You have to maintain them carefully, and they can sometimes interfere with or break your game code if they are not functioning properly or if there is a game update that brakes the Mod/CC. So.... fair warning. Use with caution.
• You can disable the Vampires pack, but you will also not be able to use the build items. All items from the pack will be disabled/not show.
  To do this: In Origin, right-click the sims icon, choose Game Properties > Advanced Game Options > Command Line Arguments. Origin has to be online, then enter "-disablepacks:GP04" without the quotes / no spaces. Save the changes and the game will open with Vampires pack disabled. To re-enable it, they just remove the command line arguments and it will load with the pack again. https://sims4.crinrict.com/eng/2017/03/disable-single-packs/
• Up-side is that apparently your sim will not be turned by a bite unless they ask to be.
• This cheat will remove the vampire trait from the sim: Traits.Remove_Trait Trait_OccultVampire

Edit for the sake of a complete list: 

• Add a butler & you can set the butler to deny visitors, and the butler will make them leave!
• Add the Private Dwelling trait to the lot.
• I was reading ant there seems to be controversy about whether this works but it can't hurt - have them each carry a garlic bulb in their personal inventory.