edited with some references
https://www.telegraph.co.uk/global-health/science-and-diseas...
https://www.independent.co.uk/news/health/coronavirus-vaccin...
edited with some references
https://www.telegraph.co.uk/global-health/science-and-diseas...
https://www.independent.co.uk/news/health/coronavirus-vaccin...
In a very limited test of a small number of monkeys who were directly injected with high levels of the virus, those monkeys still had the virus in their noses and might have been able to pass it on (in theory).
That has very little value in telling us what the vaccine will do in humans in the real world. No one will know until the Phase 3 trials are complete. It's still possible that the vaccine will be totally effective, partially effective or completely ineffective in protecting humans. That's why we need the Phase 3 trial results to know if this vaccine "works".
Honestly I'm just guessing here. I suspect this is not a real concern.