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by Uberphallus 2060 days ago
Most people don't die from flu, so that means it might be underrepresented by 0.1%.

If anything, there's less testing for flu because of covid. But nonetheless, this is sampling, not testing, the WHO performs consistent randomized sampling over time to keep the data meaningful. If they just were based on testing of reported flu cases the data would be heavily biased and basically useless in tracking the disease.