Back in January, in the second part of this post, I anticipated that EU countries were facing an imminent, devastating third wave of the pandemic over the coming months, driven by the more contagious mutations of the virus. I also wrote that the vaccines roll-out, even if proceeding according to plan (which it hasn't, mainly due to AstraZeneca's failure to supply on its contract with the EU), would not be able to help flatten the curve - they were simply too little, too late for this wave.
In the meantime, much of the talk in Europe has been about gradually lifting restrictions introduced at the beginning of winter.
But one and a half month later, as more and more countries see again their infections and deaths going up again (below figure from ECDC) and their hospitals under strain, the tone is changing and re-confinement is back on the table across Europe.
The lingering question is: would a faster vaccination have helped significantly mitigate this new wave of the pandemic, so as to avoid renewed lockdowns?
It's a legitimate question, especially as one compares with the UK, which, having achieved a much higher vaccination rate than continental Europe, is seeing its case count fall and is preparing to emerge from lockdown.
And linked to this, what is the level of vaccination where one can hope to see, if not 'herd immunity' (which we know requires around 70% of people to be immune), at least a meaningful impact on the virus propagation, a noticeable 'flattening of the curve' without the need for tough lockdown-type restrictions?
By looking at the available evidence from different countries with different levels of vaccination and at different points in the pandemic wave, the answer to the first question is, sadly, that even a flawless vaccination rollout wouldn't have avoided the need for fresh lockdowns in Europe.
The answer to the second question is more complicated and depends on a number of other factors (e.g. how many people in a given country already have some immunity after having been infected with covid in the earlier waves), but it points to a level of vaccination that EU countries are very unlikely to reach before summer. So if vaccination can help Europe re-open safely and broadly, this might only be the case from next autumn.