According to Wood, Seattle in 2003 began back-up testing of samples screened with
OraQuick. A laboratory
test, called EIA, showed that
OraQuick missed 10 out of 133 patients with
HIV antibodies in their blood. Lee said that studies have shown rapid tests to be less sensitive than lab antibody tests, adding that other rapid tests have produced similar results. Seattle officials also tested the samples with a more accurate test that looks for HIV's genetic material.