I believe that China's biowarfare agent is likely the combination of both the Covid-19 virus and the vaccines being created based on the genetic sequence they gave us.
Both the SARS-CoV-2 and vaccine mRNA have access to the reverse transcriptase enzyme, both of them can ‘upload’ their genetic sequence to the DNA (Modify the DNA to include their own images.
COVID-19 News: Harvard And MIT Study Alarmingly Shows That SARS-CoV-2 RNA Integrates Into Human Genome With Varying Implications
I think China may have outsourced part of their biowarfare development to the U.S.
This montage includes Social Media examples of negative reactions to the vaccine, some of which seem to fortell auto-immune problems in the future.