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This was followed by an improved vaccine in 1968, the Edmonston-Enders strain, according to the Centers for Diseases Control and Prevention (CDC). Doing so would require research, development, clinical trials, approval from the Food and Drug Administration, mass manufacturing and distribution -- an expensive and time-consuming process Another challenge is that separating the vaccines into three individual shots, each of which is given twice, would likely make it more challenging for families to attend six separate pediatrician appointments, meaning more children could miss shots and remain unprotected from potentially deadly diseases, El Sahly said. "A general pediatrics office is one of the busiest offices when it comes to healthcare delivery," El Sahly said. "So instead of administering a safe and effective vaccine to a child in two visits over four years, we are demanding -- or the directive points them to -- six visits over that span of time.
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