During the early 1990s, the World Health Organization (WHO) had been overseeing massive vaccination campaigns against tetanus in a number of countries, among them Nicaragua, Mexico, and the Philippines. In October 1994, HLI received a communication from its Mexican affiliate, the Comite' Pro Vida de Mexico, regarding that country's anti-tetanus campaign. Suspicious of the campaign protocols, the Comite' obtained several vials of the vaccine and had them analyzed by chemists. Some of the vials were found to contain human chorionic gonadotrophin (hCG), a naturally occurring hormone essential for maintaining a pregnancy.
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