I am not really sure why they had to create DNA/RNA vaccines. When I was young, I got measles, mumps, etc. They were attenuated virus (whole virus is weak or dead) so that your body only made antibodies to the viral antigens (on the surface of the dead virus). Why won't they make it like that? I have heard of Sinovac, but my brother says that "they won't publish their trials". I don't know what that means. I did get the moderna, but was scared to death and the second dose I felt really unwell. Chills, bad headache. felt like a guinea pig. (not sure if I could beat the delta variant on my own so I made a decision). Don't want to take boosters over 20 years or however long this crazy pandemic lasts. If someone knows why they won't give us an attenuated virus vaccine, please share. I really don't know...