Confused? Allow 1,000 of our friends to explain:
Here they are! Let's say that
% of them are infected.
Now, let's simulate an antibody test. On average, this test correctly identifies % of people who K have been infected (sensitivity) and it correctly identifies % of people who T haven't been infected (specificity).
Try a real-life test currently in use:
Roche’s antibody test was authorized by the FDA on May 3. It has a sensitivity of 100% and a specificity of 99.8%.
Cellex, Inc (pdf) made the first test to be FDA-authorized. It has a sensitivity of 93.8% and a specificity of 95.6%.
Premier Biotech (pdf) was used in recent serology surveys in California. It has a sensitivity of 80.3% and a specificity of 99.5%
people tested positive for antibodies
people tested negative for antibodies
Our test correctly identified C with antibodies, but said K had antibodies when they actually didn’t.
Our test was correct for P without antibodies but F with them were incorrectly told they had none.