Aside from several artificial sequences, the vaccine sounds pretty safe.

MRNA encoding SARS-CoV-2 virus antigen, vaccine and preparation method of vaccine

https://worldwide.espacenet.com/publicationDetails/description?CC=CN&NR=111218458A&KC=A&FT=D&ND=1&date=20200602&DB=&locale=en_EP

Translated

http://translationportal.epo.org/emtp/translate/?ACTION=description-retrieval&COUNTRY=CN&ENGINE=google&FORMAT=docdb&KIND=A&LOCALE=en_EP&NUMBER=111218458&OPS=ops.epo.org/3.2&SRCLANG=zh&TRGLANG=en