Each of these vaccines uses a cytomegalovirus, or CMVs, a group that belongs to the herpes family.

Oh great, they're going to give us all the herp, in order to...

Several small studies have demonstrated that the CMV-based Ebola and bovine tuberculosis vaccines are effective when delivered through traditional injections. Across two trials involving about 50 monkeys, the CMV-based tuberculosis vaccine reduced disease by 68 percent, researchers reported. In a separate study, three out of four monkeys vaccinated with the Ebola vaccine survived direct exposure to Ebola.

... create vaccine-resistant Ebola. What a fantastic idea.

Although the evolutionary factors underlying CMV’s species-specificity are not entirely known, there has never been a documented case in the wild or in a laboratory of a successful cross-species CMV infection.

So we don't entirely know how this all works now, but we're entirely certain that once we start fucking with it, nothing bad will happen.