The containing Wikipedia article the chimpanzee virus was attenuated, and that it doesn't replicate in humans, evidently either from that, or the modification (

The containing Wikipedia article the chimpanzee virus was attenuated, and that it doesn't replicate in humans, evidently either from that, or the modification (https://en.wikipedia.org/wiki/Ebola_vaccine#cAd3-EBO_Z https://en.wikipedia.org/wiki/Ebola_vaccine#cAd3-EBO_Z).