Just came on to counter this misinformed comment.
hamstersarse
I think it’s probably impossible to get to 1000 cases a day because of how the false positive cases occur when prevalence is low in the general community.
Lower the prevalence - higher the false positive. Even a false positive of 1% would mean 1000 cases is literally impossible
I think it’s probably impossible to get to 1000 cases a day because of how the false positive cases occur when prevalence is low in the general community.
Lower the prevalence - higher the false positive. Even a false positive of 1% would mean 1000 cases is literally impossible
This is wrong in several counts. Please, anyone who is wondering about this, if you have ten minutes, watch David Spiegelhalter himself explain (he was being misquoted last year, which led to this kind of thinking).
m.youtube.com/watch?v=XmiEzi54lBI
Firstly, if you are testing symptomatic people, the prevalence doesn’t affect the false positives in any meaningful way. The prevalence issue only matters for random testing.
Secondly you quote 1% as prevalence. I think you are really referring to the false positive rate. The false positive rate for the PCR is way, way, way lower than 1%.
the false positive rate is more like 0.05%
Finally, just look at the ONS data (which is random testing) from last summer, if you were correct, the levels being measured would have been many fold higher.