targeting a specific ethnic group would be extremely challenging. afaik, ethnicity is actually responsible for surprisingly little genetic variation. maybe you

targeting a specific ethnic group would be extremely challenging. afaik, ethnicity is actually responsible for surprisingly little genetic variation. maybe you could e.g. come up with a spike protein that's 25% better at binding an ACE2 receptor variant that 80% of ethnic group X has vs. only 30% of ethnic group Y, but that's not going to make Y immune.