Yes, through bioengineering, scientists can synthesize completely new virus strains that do not exist in nature. This technology usually involves methods such as gene cloning, synthetic biology, and gene editing. For example, scientists can use synthetic genomics technology to design and synthesize the complete genome of a virus, and then reconstruct the virus in cells. However, this kind of research involves ethical and safety issues. The creation of new virus strains may bring potential biosafety and bioprotection risks, so in many countries and regions, such experiments are strictly regulated and must follow a series of ethical reviews and legal regulations. In addition, the purpose of this research is usually for scientific exploration, vaccine development or disease control, rather than for the creation of harmful pathogens. Therefore, the scientific community is cautious about this kind of research and advocates responsible scientific practice and supervision.