Nobody should rely on any vaccine for the foreseeable future. Questions about whether it will be inert or live are premature.
The only thing we, as individuals, can do is mitigate risk.
Last weekend, I left the house for the first time since mid March. I went to Tesco and to a garden centre. On both occasions, I had to queue, which was fine. The garden centre had hardly any customers and the assistant took contactless payment, so that was fine too.
However, I was quite shocked by the behaviour of some people in Tesco. The store was well organised and I noticed that all trollies and baskets were being wiped down. Hand sanitiser was available.
People weren't following the one way system, people were chatting in the aisles, closer than two metres apart and stopping people from passing safely. Others were just leaning over me and not respecting my distance at all. I saw people in the road, including same sex pairs and groups of similar age (usually middle aged) and larger groups of younger people, who probably aren't related.
According to the KCL Covid-19 tracker, 0.3% of people between 20-69 in my area are currently showing symptoms. Hopefully, those people are self-isolating, but there will be a similar number of people who are infected but not yet showing symptoms. That means that 1 in 333 people is infected. I probably saw just over a 100 people when I went out, so the chances are quite small that one of those people is infected. Nevertheless, there is a risk and it's one that could be avoided if people were more thoughtful.