Rapid failures: The Hindu Editorial on antibody testing kits
The HinduRapid testing kits that State governments have been using to detect antibodies to the novel coronavirus have proved unreliable, making the shift to normal life after the lockdown ends on May 3 more difficult. While the diagnostic RT-PCR test to confirm the presence of the virus using a nasal swab in a laboratory setting is considered reliable, attempts to design a rapid test that uses a blood sample to find antibodies after past infection have thrown up errors in as much as a third of cases: a study in the U.K. showed that they were high on specificity — accurate in cases that they found to be antibody positive. This is the phenomenon worrying India, which has imported several hundred thousand rapid testing kits, and its experience is shared by the U.S., U.K., Spain and other countries. Rajasthan had laboratory-confirmed COVID-19 positive cases not being detected by rapid testing kits.