NEW YORK (GenomeWeb News) – Prodesse announced after the close of the market Thursday that the US Food and Drug Administration has cleared for marketing the firm's ProGastro Cd Assay.

The real-time PCR assay detects toxigenic strains of Clostridium difficile, a healthcare-associated infection that affects around 500,000 patients in the US annually. The test provides results in as little as three hours, said Prodesse.

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The US Food and Drug Administration has new guidelines that enable some gene and cell therapies to undergo expedited review, according to the New York Times.

Using gene drives to control invasive species might be too risky, an initial advocate of the approach says.

Researchers have grown tumors in 3D cell cultures to better understand cancer, the Economist reports.

In Science this week: intellectual property experts argue patent battles such as the one over CRISPR are wasteful, and more.