There are many things that weren't tested for because it took too long; there will be results as the vaccines are distributed and recipients respond to CDC queries. I joined a study by phone and over the next six weeks have answered questions about symptoms following the inoculations. Those may be less scientific because not everyone joins, but any information helps.

Scientists working on treating COVID-19 eventually hope to be able to say that the vaccines not only stop recipients from catching COVID-19, but vaccinated people won't catch or spread it. Like polio or smallpox. But the claims must await the test of time. In the meantime, their qualified remarks give the anti-vaxxers a target to shoot at, as willfully-uninformed as they are about the whole thing.