Shares of Enzo Biochem Inc. /zigman2/quotes/203989318/composite ENZ +1.20% rallied 7.7% in premarket trading on Monday after the company said it received an emergency use authorization from the Food and Drug Administration for its COVID-19 diagnostic test. The regulator issued the EUA on July 7. It has granted emergency authorization to at least 137 diagnostic tests during the COVID-19 pandemic. Enzo's stock is up 8.7% year-to-date. The S&P 500 /zigman2/quotes/210599714/realtime SPX +0.06% has declined 1.4% since the start of the year.