Concerned re the new vaccine strategies? Worried that delaying the second dose is a bad idea or that it might make the virus resistant? Confused re mix and match vaccines? I’ve compiled this short explainer, pls read and share. TL/DR; on balance, nothing to be concerned about 1/2

Explanations are attached to my first tweet above. Attached to this tweet is a fuller explanation as to why the virus is very unlikely to get “resistant” to the vaccine if the second dose is delayed 2/2

I’ve been asked for more info re the Vitamin D advice. Here’s a tweet I sent a few weeks ago with lots of info about it. To date, the open letter has now been signed by more than 170 top experts, not just the 66 we had when I first tweeted this. https://twitter.com/dremilygrossman/status/1339890267554537474?s=21

Pfizer said on BBC news this evening that there’s no reason to think effectiveness should go down if the second dose is left for longer - if anything it may well go up. And here’s an article re the updated data showing 90% effectiveness of first dose https://theconversation.com/amp/pfizer-vaccine-what-an-efficacy-rate-above-90-really-means-149849

And here’s a super helpful thread explaining where the 90% efficacy figure for the first dose comes from (and why it’s NOT 52% as people keep saying), with a quote from the JCVI at the end summarising it: https://twitter.com/theosanderson/status/1344347380917940226?s=21