One of the other DNA virus efforts just reported they made several different vaccines from different parts of the spike protein. They tested on monkeys (like Oxford) and ALL vaccine recipients developed IgG. Some vaccines were VERY effective. Then they challenged the vaccinated monkeys with large viral loads. None got sick. The very effective vaccine ones never had any measurable virus. The less effective vaccine ones had asymptomatic cases with positive PCR throat swabs.
So I think we got this, as far as monkeys go.
