I am under the impression that there are a number of vaccines that "work" currently in safety trials.I am a realist. The challenge of coming up with a vaccine that works is the first one. One that needs liquid nitrogen will not be practical in the DR.
In a few years we will know more.
Russia and China had a vaccine that may or may not "work" that was released months ago.
China gave it to soldiers in the army and Russia released it to the general public.
Of course with both countries they cannot be relied on to be truthful about anything that could reflect poorly on either country.