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Why Do We Still Don't Have a Vaccine?
There have been, I don't even know how many different candidate vaccines that have made it through various stages of preclinical and clinical trials. But so far, it's just been very difficult to develop a vaccine that has a good balance of immunogenicity. And we had really bad experience with the vaccines we tried to develop in 1960. So another potential way to protect those youngest babies who are most vulnerable is maternal vaccination.