In Polycraft World, it turns out all sheep have COVID! While this isn't great for the sheep, it will help you in your quest to find an effective vaccine to save Polycraft World citizens. To get a COVID Sample, all you need to do is use a beginner DNA Sampler on a sheep to get a Sheep sample and mix this sheep sample with salt water in the Bioreactor. This will get you a sample of both COVID DNA and mRNA. It is up to you to determine which vaccine is best!