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Boston Medical Center's test is designed to detect regions in the virus' N gene, while Beijing Wantai's test measures antibodies against the virus.
UCSF's test, developed with Mammoth Biosciences, uses CRISPR technology, while the tests from the Broad Institute and BioSewoom are PCR-based.
The test runs on the company's DZ-Lite 300 Plus chemiluminescence analyzer and is designed to detect immunoglobulin G antibodies against the virus.
The Enzo and Access Bio tests may be performed by any CLIA-certified high complexity lab, while use of Gene By Gene's test is limited to its developer.
Four diagnostic firms have gone public so far this year, with three of the companies based in China but filing for US initial public offerings.
Laboratorio Clinico Toledo's test detects SARS-CoV-2 nucleic acid, while Assure Tech's test is designed to detect antibodies against the virus.
The guidance suggests validating a five-sample pooling strategy, but notes that this may need to be adjusted depending on assay sensitivity and local prevalence.
The real-time RT-PCR multiplex test is intended for the simultaneous detection and differentiation of SARS-CoV-2, influenza A virus, and influenza B virus.
Of the 28 companies in the index, 21 firms saw their stock prices increase throughout the first half of the year, while seven firms' share prices decreased.
Earlier this month Centogene said that previously acquired laboratory space in Hamburg is now exclusively performing SARS-CoV-2 testing.