It's the lockdown that is slowing down the spread of the virus.
In all likelihood, most of us will get it. That was always a given. The issue was when we got it, and how well the NHS would be able to cope.
The fact that we've not needed the the full capacity is testament to the lockdown reducing the rate of the spread or 'flattening the curve'.
If we'd done nothing, the models predicted deaths in the hundreds of thousands, many of which would be down to our inability to treat them at that moment.
In addition to that 'flattening the curve' also buys us precious time to:
- Prepare for extra capacity
- Better understand the virus itself and the best treatments for it
- Obtain more PPE
- Buy thinking / planning time
We mustn't think any relaxation of the lockdown is an indication that the virus is going away, more that we are managing it at a level we can cope with.
That's going to mean any reduction will need a period of time to measure the effects. So if we open up schools, we'll need at least 3-4 weeks of measuring the effects of that before deciding if we can relax a bit more, or need to tighten again.
Testing is still a bit of a problem, because you can test someone today, and they're clear, but tomorrow they get infected. So we'd have to continually test people for negative results.
Testing for positive or formerly positive (had it in the past) should be more effective, as long as we have some level of certainty that a second infection will not do more harm. If you don't have that certainty, it's not much use (other than an indicator of how prevalent it really is, which we still do not know).