By RICARDO CASTILLO Mexico Pre-Purchases Covid Vaccines Mexico clinched the purchase of 200 million anti-covid-19 vaccines to protect 100 million people (about 80 percent of the population), the Foreign Relations Secretariat (SRE) announced through Twitter on Friday, Nov. 27. SRE Secretary Marcelo Ebrard and the secretariat’s team of vaccine procurement buyers for individual laboratories and the World Health Organization (WHO)