MADRID — Health Minister Salvador Illa said that, beginning Saturday, Spain will receive 4.5 million Pfizer vaccine doses over the next 12 weeks, enough to vaccinate some 2.3 million people. Illa said on Wednesday that the first batch would arrive in the central province of Guadalajara and be distributed around Spain from there so that vaccination could begin as planned on Sunday. The ministry reported 12,386 new COVID-19 cases on Wednesday, up from 11,079 on Tuesday, for a total of 1.8 million. There were 178 new confirmed deaths, down from 260 on Tuesday. The 14-day cumulative index, closely watched by epidemiologists, rose to 254 per 100,000 inhabitants, up from 236 a day earlier but still down from the second-wave high of 529 on Nov. 9.