Even though it failed in that species of monkey, it might still work in humans. We are not identical. Hopefully, they tested it in ferrets (which are known to get infected). They would find out in the first trials if humans developed neutralizing antibodies. That would take about a month.
There is an American vaccine that was tested in a different species of monkey, with spectacular results. So even if Oxford fails, there are plenty of good vaccines in trials. Astra Zenica has said they can produce 200 billion doses quickly, so even if it's not the Oxford vaccine, it will be some good one. That manufacturing capacity is not going to sit idle.
