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Presumably, they tested a representative sample at some point and extrapolated

Extrapolated what? I am taking what the CDC is saying here as truth, at which point it seems almost impossible that 99.5% of people would know correctly if they have toxoplasma... it would seem like your accuracy on guessing that should be extremely low. (FWIW, I am guessing that you somehow failed to read the context of the conversation and are saying the CDC tested a sample of the population and extrapolated the number of people who have it... "duh".)

Like the various health authorities in the US tested a representative sample for Covid RNA, antigens, and antibodies to determine unbiased population level data?

/me runs.

You run, but it’s pretty obvious one reason that never happened is because you can use the phrase “best available evidence” to do whatever you want when you control the funding for evidence gathering.

That’s unnecessary. The CDC and the WHO are perfectly willing to make statements that contradict the best available evidence even without deliberately suppressing the production of better evidence. It’s easier to just ignore the evidence.

(I don’t think this is malice. A combination of being unwilling to admit mistakes and simply not being very good at one’s job seems more than adequate to explain this.)

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