AFAIK there has never been much of an effort, because it is not a high priority vaccine. Based that all vaccinations can have a side effect, why would you devel

AFAIK there has never been much of an effort, because it is not a high priority vaccine. Based that all vaccinations can have a side effect, why would you develop a vaccine for it. And for the other SARS I suspect they were to quickly contained by other means to warrant development of a vaccine.