Companies like Moderna are working on mRNA based vaccine as they can trigger both cell mediated as well humoral arm of immunity. But why traditional protein based vaccines can't trigger sufficient cell mediated immune response ?
My based on the work plan in protein trigger in case of immunology study it is very fought job... protein based vaccines can't trigger in cell mediated immune response time consuming more and we cannot timely workout or trigger in cell responses...till the work is going on.....