Chat about Novel Coronavirus - 2019-nCoV - COVID-19

So if 5% of the population have had it then using 98.5% and 99.5% figures we get:-

-ve result would be 99.973% accurate
+ve result would be 91.284% accurate

If 1% of the population have had it then:-
-ve would be 99.995% accurate
+ve would be 66.779% accurate

If 10% of the population have had it then:-
-ve would be 99.944% accurate
+ve would be 95.673% accurate

What are you doing to get a shift in sensitivity/specificity based on an outside factor?