So, the key message from our finding is we found that recipients of the Pfizer vaccine, those who have had two doses have about 5 to 6 fold lower amounts of neutralizing antibodies. Now, these are the, sort of, gold standard, private security antibodies of your immune system which block the virus from getting into your cells in the first place. So, we’ve found that that is less for people with two doses. We also found that for people with only one does of the Pfizer jab that they are less likely to have high levels of these antibodies in their blood. And perhaps most importantly for all of us going forward is that we see that the older you are the lower your levels are likely to be and the time since you’ve had your second jab, as that time goes on, the lower your levels are also likely to be. So that’s telling us that we are probably going to be needing to prioritize boosters for older and more vulnerable people coming up soon especially if this new variant spreads.

Dr David Bauer