Yes, from the preprint it appears that the confidence interval includes 0% prevalence. Also, the sample is very biased (elective surgery admissions), so I'm not sure whether the inference to the entire population makes sense
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"Convenience samples".. Is that now a thing in seroprevalance studies? From other serological survey that's been funded in Oz, the only reference I've heard was in NSW CHO pres call. She said samples were "opportunistic": left-over path lab test samples, blood bank sera. Random?
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Opportunistic and convenience basically the same - typically what you can easily acquire from say diagnostic labs. Good when you have high+fairly uniform exposure (e.g. useful for monitoring immunity to infections like measles). Not so great for low-prevalence COVID settings.
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