Prime Minister Yoshihide Suga on Tuesday reiterated his pledge to secure enough COVID-19 vaccines for Japan's entire population by the first half of next year after a U.S. drugmaker said its experimental vaccine proved more than 90 percent effective."We will continue to negotiate with firms both in Japan and abroad" to ensure Japan can purchase enough doses, Suga said during a House of Representatives session.Pfizer Inc. has said the efficacy of its vaccine, developed with German partner BioNTech SE, was proved in a late-stage clinical study with more than 43,000 participants.Japan has agre…READ FULL ARTICLE