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A collection of some classic Lemmy memes for your enjoyment
The meme is talking about a common probability error that surveys have shown even doctors are prone to making.
Why you're probably ok:
The rarity of the disease far exceeds the error rate of the positive test. Meaning, the disease occurs in 1 out of a million people, so if you are tested at random and show positive, you only have a 1 out of 30,000 chance (the 3% false-positive rate) of being the the 1 person who truly has the disease.
Interpret it how you will.