Nanjing Vazyme Medical Technology C., LTD and Innovita (Tangshan) Biological Technology Co., Ltd are based in China, Biolidics Ltd. is based in Singapore, and CTK Biotech is based in the United States.

Dr. Mary Jean Loreche, chief pathologist of the Department of Health in Central Visayas (DOH-7), said these test kits have the highest specificity and sensitivity yields during their laboratory validation hence, their decision to use these kits in the community testing.

&ldquo When I came on board for the technical working group for the community testing, the first thing that I said was: &lsquo I need    a test kit that I have faith [in].&rsquo If you will check in my 30 years of practice, I will not sacrifice results, quality versus something that I do not have faith in,&rdquo Loreche said.

Loreche said all four kits are approved by the Food and Drug Administration (FDA).

Although only the Research Institute for Tropical Medicine (RITM) in Metro Manila is the only center authorized to conduct a validation of the kits, Loreche said they conducted independent validation tests on the kits in order to determine which will be best used for the community testing.

During the validation, Loreche said they tested samples from confirmed coronavirus disease (COVID-19) positive and negative patients in order to determine the specificity and sensitivity rating of the kits. The specificity rating refers to the capability of the kit to detect a &ldquo true positive&rdquo while the sensitivity refers to the accuracy in detecting &ldquo true negative&rdquo samples.

Loreche said the sensitivity ratings for these kits are at least 96 percent while its specificity marks are at 99 percent, Loreche said.

The specialist added that with these ratings, the four test kits show a very minimal margin of error in detecting the presence of infection. However, Loreche emphasized that results for the antibody test kits cannot be used as the main diagnostic tool for COVID-19.

Those who will yield a positive result in the antibody-based test will still have to be verified through the polymerase chain reaction (PCR) test, which is considered as the gold standard in diagnosing COVID-19.

As of May 17, the OPAV-initiated PBB has identified 372 persons who participated in the rapid mass community testing that will have to undergo swab testing for PCR test. This is only 1.9 percent of the total samples that have been collected and tested under the PBB. /bmjo