Disease

Disease on Roshar is virtually non-existent, though there is the common cold that was brought to the world by some members of The Seventeenth Shard. According to Brandon, that's going to die out pretty quickly. The Rosharan people will get over it because their world is highly Invested.YouTube Livestream 32, 6/3/21
The common cold has come over multiple times before from another world. If one wants something like that to happen, one would go to a world that's not quite as highly Invested where there might be a few more diseases; one picks up a disease, brings it, and it spreads a little bit but then dies off. This sort of thing happens a lot in the cosmere.YouTube Livestream 32, 6/3/21
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