Sorry I missed all yesterday's fun on this thread. My excuse (were one needed) was: up at 5, train at 6 to Penzance and rode the 200+km back, in a small group and to bed by midnight. (Plan at bottom)
Would be interested to hear from
@midlife the source for 'one dose doesn't reduce transmission'. My understanding is that the recent SPI-M modelling have made 'clear' and more positive assumptions in that respect in their latest work.
@Craig the cyclist asks for a plan.
I think the '12 week gap' was considered reasonable because getting more people vaccinated with just one dose was more likely to save lives, and I think that's been proven. I note that, around the world, the gap seems to have been extended generally, though not to 12 weeks. Why 12 weeks (not 8 or 16)? I'd observe that directing a 12 week gap allowed the UK to vaccinate (first dose) the more vulnerable half of its population at speed, without having to slow progress because the second doses would need rolling out. All those in JCVI 1-9 (the first phase, 32M) received their first dose by 11 Apr, and only 7M second doses had been expended by then. From then all the '12 week gap' second doses have consumed most of the supply.
By now (or in the next few days, too soon to muck around with second jab appointments) all those in JCVI 1-6 will have received their second jab, leaving under the 50-64 crowd with one jab in their deltoid.
I mused (here) back in January about the 12 week gap and whether direction might shift (increase) as it did on 30 Dec 2020 (JCVI). The problem is not medical but political. The government has told its electorate that the gap will be 12 weeks, and the political cost (see
@Julia9054 post which started the current chat) is unattractive.
However, I reckon the government could play the B.1.617.2 variant card and use that to justify a slight change of policy.
From 23 May for 5 weeks the current plan is to give 12M doses as second jabs (and these are all for 64 and under): yes, many have appointments. The last 5 weeks have seen necessarily glacial progress in first jabs: maybe 5M in 5 weeks.
A possible alternative plan (and I appreciate there is resistance within the NHS to changing things)
@Craig the cyclist is this:
1) Explain revision the policy clearly (blame new variant, hold out carrot of 'not earlier than 21 June' date)
2) Continue with all second dose appointments for the next 10 days (cumulative second doses = 23M)
3) Postpone all second doses (with appointments already or not) to 16 weeks, wef 10 days time.
4) Accelerate the rate of giving first jabs (assumes no increase in supply/rate) using the 10M doses 'freed up'. This amount would vaccinate (first dose) all those over 27 (by 21 June
) roughly. If a way could be found to weight those supplies on the areas which have high case levels, excellent, but this will be more presentational than based on science (as
@midlife made clear).
5) Increased community/leader involvement to maximise vaccine uptake in those areas.
6) Provide new appointments effective delayed by 4 weeks, for all those affected.
I suspect that the supply of Pfizer (for under 40s) would make this difficult to implement, or at least lead to organisational complication and associated friction. Perhaps recognise the male/female ORs for CSVT and reserve the available Pfizer/Moderna for female under 40s.