Medical researchers have been ____ vaccinations and their ____ on patients for more than a decade. While vaccines have saved millions of lives and ____ many deadly diseases, such as polio, some are reluctant to receive them because of reports that ingredients are questionable, and may even result in people ____ other diseases unintentionally. Opponents argue that ____ of the spread of disease through a population must be done by vaccination. But reactions to vaccines continue. In some rare cases, patients never recover from the effects of the vaccine. Many want the medical profession to ____ better quality vaccines and ____ the ones that do not work as intended.

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