Adam Briggs Profile picture
25 Feb, 22 tweets, 12 min read
This week's PHE surveillance report now out. Covers 15-21 Feb (half term).

Case rates falling, vaccinations increasing, but inequalities being exposed and still a lot of people in hospital and on ICU. 🧵

gov.uk/government/sta…
Fall in case rates beginning to level off except in 70-79yrs and 80+, the vaccine is playing it's part!
For regions, there is now a distinct and worrying split between low case rates in the south of England, and higher case rates in the north.
Again, as case rates fall, the structural inequalities underpinning much of this pandemic are exposed.

Places where people can't work from home or live in multiple occupancy households are going to come out lockdown with higher case rates than elsewhere in the country.
This means that the socioeconomic recovery will be slowest in the places that need it most.

It is in everyone's interests to address the structural drivers to inequality for reasons of social justice, health, productivity, new variants, econ recovery etc

Fairly big drop in lateral flow device use (LFDs, rapid tests for those without symptoms) given half term and much of that is being done in schools.

This means pillar 2 positivity rate has plateaued (includes both PCR tests for those with symptoms as well as LFDs)
This likely explains the uptick in positivity among 10-19yr olds. The 5-9 and 0-4 higher positivity rates could be due to a range of reasons, but fortunately this isn't reflected in higher case rates in surveys or PHE data.

Differences in infection rates by ethnicity are less stark than they were, but still very apparent in some regions.
And differences by deprivation group remain as bold as ever as case rates drop.
Still outbreaks in care homes reported to PHE despite vaccination, it's not a huge jump in number but shows we're not out of woods despite the amazing vax effort.

Also, among those infected who have been vaccinated, they will have a markedly lower risk of severe disease.
Number of outbreaks in hospitals that are reported to PHE remains v low
And schools haven't been open.
Finally, really good to see a drop among workplace settings.
Hospitalisation rates continue to fall sharply, driven by older age groups.
There isn't a significant difference between hospitalisation rates in the regions either, but this is worth watching closely.
It's also great that ICU admission rates falling fast as well. Particularly given that ICU is occupied by people who are younger and are less likely to have been vaccinated.
More variation here by region as patients are repatriated to local hospitals when beds become available, and because generally lower numbers.

Admission rates going down everywhere.
*But* the number of people in hospital and the number on ICU are still at 75% of the first wave peak.
Finally, deaths from COVID may be falling but there's still significant excess mortality.
So whilst it's great that schools are going to open and the vaccines are working, lockdown continues for everyone else.

That's so important, both to try and keep R</=1 as vaccinations increase, and to allow health systems that bit more time to recover.
And beyond the immediate policies aimed at limiting viral transmission, addressing structural inequalities simply can't be ignored.

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More from @ADMBriggs

26 Feb
This week's T&T update. Covers 11th-17th Feb.

Tl,dr
testing, cases, and contacts all down
performance steady
and a critical need to tackle inequalities.

gov.uk/government/pub… Image
First decent fall in number of people being tested this week (not including Christmas/NY).

Down 14% to 2.6m. Image
Lateral flow device (LFD) use for people w/o symptoms has fallen for the first time as well as PCR.

Part this will be because this week covers the first few days of the school half term (15-19 Feb) and much of LFD use is in schools.

Would expect this to bounce up again next wk Image
Read 19 tweets
23 Feb
I know others will have found these things before me but I've been home-schooling all day so only getting round to reading the roadmap now.

A few things stick out on first pass

(tl,dr: inequalities, testing, isolation support, social care, and inequalities).
There's a section on 'Test, Trace and Isolate' (who says NHS Test and Trace has a branding problem).

As expected, big focus on testing plus a further £400m for local gov through the contain outbreak mgmt fund - details tbc but likely much is for local testing/variant mgmt. ImageImage
As have said, there remains a big challenge of people not getting tested in the first place (fear of being unable to isolate, job insecurity, caring responsibilities etc). Surveys suggest just 1/3 get tested regularly if symptomatic.
Read 12 tweets
18 Feb
This week's PHE COVID surveillance report now out.

Most recent week covers 8th-14th Feb.

tl,dr: Things continue to improve but NHS bed/ICU situation has only *just* dipped below April peak. And some potentially worrying regional variation.

gov.uk/government/sta…
Case rates and positivity falling relatively fast. And across all ages.
Percentage of tests positive also falling, but this pillar 2 (community testing) graph has also been causing people some concern re young school children and returning to school - despite reported case rates being the lowest of all age gps.
Read 23 tweets
18 Feb
Most recent T&T data now out, covers 4th - 10th Feb

LFD use continues to rise but more slowly than last week and T&T performance remains consistent.

And as ever we don't know about who isn't tested and who struggles to isolate.

🧵

gov.uk/government/pub…
The number of people being tested each week remains high at around 3m, but this is due to increasing use of rapid lateral flow devices as PCR test use falls.
The number of LFDs used has increased five-fold since the start of Jan, and 35% in the past two weeks (although noticeable slowdown this most recent week).

By contrast, PCR test use for people with symptoms fallen week on week for the past month (PHE positivity data due later).
Read 17 tweets
18 Feb
Latest REACT-1 study results are really important.

The headline result of prevalence now at around 0.5% masks big differences by region, employment type, HH size, and keyworker status.

(and note - in the summer, prevalence was more like 0.05-0.1%)

1/5

spiral.imperial.ac.uk/bitstream/1004…
Relative drop in prevalence between round 8 (6th-22nd Jan) and 9a (4th-13th Feb) is far greater in the S than the N and may be plateauing at around 1% in the NE.

It's helpful to know that trends in REACT generally follow trends in national PCR positivity data (in red). 2/5
Differences by deprivation group exposed yet again, plus if living in large households. Less stark differences by ethnicity (although v wide confidence intervals).

And this is AFTER adjustment for things like age, region, key work status, HH size, deprivation, ethnicity. 3/5
Read 5 tweets
14 Feb
Latest Test and Trace data now out. Covers to 3rd Feb.

Some useful separation of LFD and PCR tests, and new data on end-to-end contact tracing.

Summary in figure,🧵for the detail.

gov.uk/government/pub…
As case rates fall across the country, the number of people being tested is up 7% of last week to over 3m for the first time.

Over 5% of the population.
And as you can see from PHE data to 7th Feb - the increase is from the use of lateral flow devices (LFDs) to find cases among people without symptoms.

The number of people tested using PCR tests each week (and the proportion coming back positive - positivity) is still falling.
Read 24 tweets

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