I do believe sadly it's going to take some diseases coming back to realize that we need to change and develop vaccines that are safe.

Summary

This quote implies that the speaker believes that there is a need for vaccines that are safe, and that unfortunately, it may take the reemergence of certain diseases for people to realize the importance of making such changes. By suggesting that diseases need to come back, the quote suggests that people often fail to recognize the value of vaccines until they experience the consequences of not having them. It emphasizes the necessity of developing and implementing safe vaccines to prevent future outbreaks and protect public health.

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