It is endemic in the simian population. It will keep crossing over into humans again and again. It has done it before several times. People who live near forests would have to be on Prep everyday of their lives. The reason they eat bushmeat is the because they are poor and will be too poor to afford daily medication. A once-and-done vaccine would at least stop new crossovers. Only then could we really get a handle on ending this disease world-wide.