negative – adj. in a medical test, negative means the person being tested does not have a disease or condition

sample – n. a small amount of something that gives you information about the thing it was taken from

confidence – n. a feeling of being sure in one's ability to do something

positive – adj. in a medical test, positive means the person being tested has a disease or condition

quarantine – n. to keep (a person or animal) away from others to prevent a disease from spreading
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