I don't know but the problem is more with low infection rates. Suppose you have 3% false positives and 3% false negatives, and 0.1% of people are infected. The

I don't know but the problem is more with low infection rates. Suppose you have 3% false positives and 3% false negatives, and 0.1% of people are infected. The false negatives will be 3% of 0.1%. The false positives will be 3% of 99.9%. You exaggerate your infection rate by about 30X even though the test is equally inaccurate in both directions.