UPDATE 3-GSK aims for 1 bln doses of booster as COVID-19 vaccine race heats up By: Reuters: Company News May 28, 2020 at 07:47 AM EDT * For a FACTBOX on COVID-19 drug development, see: (Adds details on global vaccine approaches, GSK's vaccine adjuvant) Read More >> Related Stocks: Astrazeneca Plc ADR Banco Santander ADR Gsk Plc ADR Moderna Inc