GENEVA/NEW YORK, April 15 (Reuters) - A fund-raising event organised by the Gavi vaccine alliance and the United States secured more than $300 million in fresh funds and COVID-19 doses for the COVAX vaccine-sharing facility, USAID Acting Administrator Gloria Steele said on Thursday. “Investment in COVAX is a prerequisite for recovery ... Ending the acute phase of the pandemic is currently the best economic decision for any country,” Jose Manuel Barroso, chair of the Gavi vaccine alliance, said after the three-hour event. The United States, which has contributed $2 billion to COVAX this year and pledged $2 billion for next year, did not announce any new commitments. (Reporting by Stephanie Nebehay in Geneva and Michelle Nichols in New York;)