11. Mass immunization drives aim to eliminate the virus from the environment by breaking its transmission cycle.12. Mass immunizations did it, at a cost of more than $ 500 million in the Americas.13. But the disease was nearly forgotten in the West after mass immunization was introduced in the 1920s. 14. The city has not offered mass immunization against the disease since an outbreak in the early 1980s. 15. Mass immunizations have been instrumental in controlling and even eradicating viral diseases, including smallpox, polio and whooping cough.16. UNICEF attributes Philippine success against polio to a mass immunization program for children under age 5 begun in 1993. 17. Merck editors voted " mass immunization campaigns " as the second most important medical advance of the 20th century. 18. But today, most governments conduct mass immunizations , which reach 80 percent of children and save three million lives a year. 19. Han said the figure had been drastically reduced to 699 clinically confirmed cases in 1994 thanks to mass immunization efforts. 20. Eradication of other diseases, however, is closer, and mass immunization programs as part of FID may be a major tool.
