Make sure you're checking all the processed food you eat and all the medications you take.

Think about it, if the DS is trying to get to you secretly, why wouldn't they just mass-dose your food, or mass-dose your over-the-counter medications like Advil, Tylenol, etc? It's so much easier to do that than a vaccine.

It's the reason most McDonalds meat is "filler", because they know you won't question it.