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Happy Tuesday! The latest focal S:N501 build is now updated with sequences from 11 Jan.
There are 101 new sequences in the 501Y.V1 (B.1.1.7 #b117) & 501Y.V2 variants.

Additionally, I'll include some updates on S:E484K in this thread.

1/20

https://t.co/dXx6nk6Llz

 There are 97 new non-UK sequences in 501Y.V1, including the first sequences in the cluster from Slovakia, Mexico, & Belgium, plus additional sequences from the Netherlands, Denmark, Australia, Spain, Ireland, & Sweden.

2/20
Slovakia has 10 sequences that fall in 501Y.V1 for the first time. These are closely linked, & likely indicate a single introduction and ongoing transmission (remember: vertical distance is not meaningful on the same branch - position of the 2 English samples is arbitrary).

3/20
Belgium has 5 sequences in 501Y.V1 for the 1st time, indicating 3 separate intros. 3 seqs cluster together (zoomed, divergence), indicating a single introduction. The connection to Netherlands might indicate transmission, or 2 transmissions from same diversity in the UK.

4/20
Mexico also has a sequence that falls into 501Y.V1 for the first time.

5/20
Ireland has 36 new sequences. Many represent separate introductions, but some do cluster with older sequences & may represent local transmission, or introductions from the same UK diversity.

6/20
Denmark has 29 new sequences (orange). These represent both new introductions, and further expansion of the large cluster (zoomed view).

7/20
The Netherlands have 6 new sequences. All fall within the section of the tree marked in red.
Zooming in, the new sequences are marked in red: 2 are separate introductions. Zooming in further (divergence view), cluster at the top are identical to an older sequence.

8/20
Australia has 6 new sequences, including the first from Northern Territory and Victoria. 1 pair of sequences from Victoria are identical to each other, representing one introduction.

9/20
Spain has 2 new sequences (yellow). One represents a separate introduction. The other links to older Spanish sequences, but it's unclear from sequences alone if this is local transmission or transmissions from a common source.

10/20
Sweden has 2 new sequences, marked in red. Both represent independent introductions. The second one is hard to see, but zooming in shows this more clearly.

11/20
Now turning to 501Y.V2:

There are 4 new non-South African sequences in 501Y.V2, including the first from Ireland (3) and the Netherlands (1).

12/20
Ireland has 3 sequences in 501Y.V2 for the first time. They cluster together, and may indicate either local transmission, or a common exposure (pictures 1 & 2).

The Netherlands has its first sequence in 501Y.V2 (picture 3).

13/20
As usual, the updated country graphs are also available. As always, interpret with care: countries are selectively sequencing to track 501Y.V1, so proportions of sequences are not representative for many countries.

14/20

https://t.co/c7wlQOLRiq
Finally, an updated focal S:E484 build is also up.

S:E484K is found predominantly in the 501Y.V2 variant, & in a cluster of sequences primarily in Brazil, though it has appeared numerous times in the past.

15/20

https://t.co/Od95D6DL74
S:E484K has been discussed recently as there are suggestions it may impact how well the immune system can recognise the virus, particularly if you've been infected with SARS-CoV-2 before.

Links to the studies are on https://t.co/SmanZBHpse

16/20
Additionally, over the weekend, travellers from Brazil to Japan were found to be infected with a novel variant with many mutations, including S:E484K & S:N501Y.
Translated report linked below.

17/20

https://t.co/G1ITeT3MoV
To help viewers identify these new samples from Japan, I've added a *temporarily* label to the S:E484K build: 20B/S.484K.501Y.

Additionally, I've added a *temporary* label to the Brazilian cluster with S:E484K: 20B/S.484K.

18/20
Interestingly, though the recent Japanese sequences carry S:E484K & seem to originate from Brazil, they do *not* branch from the larger 484K cluster in Brazil, but instead sit on a long branch separately within the 20B Clade.

19/20
Getting case numbers down saves #LivesAndLivelihoods, and reduces #SARSCoV2's opportunities to explore situations with unique selection pressures, potentially resulting in mutations expanding that we'd rather not see.

Help make my updates more boring: bring cases down!

20/20
PS - For related but slightly-different-angle updates on 501Y.V1 (B.1.1.7) & 501Y.V2 (B.1.351), you should follow @AineToole & keep an eye on her tweets about updated reports!

https://t.co/fZDQqwvJmr

21/20

More from Dr Emma Hodcroft

Dr Emma Hodcroft
Dr Emma Hodcroft
@firefoxx66
Lots of tweets about this today!
Let's see what we can see in the focal S:E484 build!

Phylogenetics (what I do - making 'family trees' from virus genetics) can be very informative to see how different variants are spreading, and how cases

There are two variants circulating predominantly in Brazil:
- 20B/S.484K seems to be older & more widespread. It has (among others) a mutation at position 484
- 20J/501Y.V3 is smaller & detected recently. It has mutations at 501 *and* 484.

2/10

https://t.co/Cw5u2kuATa


The variant predominantly in the UK (501Y.V1 / B.1.1.7) and the variant predominantly in South Africa (501Y.V2) also both have 501. 501Y.V2 *also* has the 484K mutation.

Why are there concerns about these mutations? You can read more at https://t.co/wVE7ubYBoy!

3/10


The view below is from an analysis focusing on sequences with a mutation at 484. It shows all the samples in the 2 variants (20B/S.484K & 20J/501Y.V3) & how they're related. More closely related = closer together (very, very roughly).

4/10


We can colour these samples by region to see where they're from. As we expect - most are in Brazil! A few are in Argentina (also red).

5/10

https://t.co/Cw5u2kuATa
SOCIETY
Dr Emma Hodcroft
Dr Emma Hodcroft
@firefoxx66
The latest focal S:N501 build is now up! It includes data from 4 Jan 2021.

We have new sequences in 501Y.V1/B.1.1.7 from Denmark, Singapore, Australia, Italy, Spain, France, Portugal, Germany, Brazil, Jamaica, Luxembourg, Pakistan & the USA.

1/12

https://t.co/FTjvV7T7wL


Denmark has 43 new sequences (in orange). These indicate additional introductions, as well as further expansion of the existing large local transmission cluster we saw previously (shown in zoomed divergence view).

2/12


10 new sequences from Portugal (orange) indicate additional, separate introductions.

3/12


Singapore has 5 new sequences (yellow). These indicate at least 5 separate introductions for the total of 6 sequences, with two identical sequences likely being 1 introduction.

4/12


5 new sequences from the US, from Florida & California (older sequences crossed through).

Zooming in (divergence view) on the California cluster, the relationship between these samples is difficult to infer from phylogenies alone.

5/12
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Dr Emma Hodcroft
Dr Emma Hodcroft
@firefoxx66
The focal S:N501 build has been updated with data from 15 Jan, & includes 164 non-UK, non-South African sequences in 501Y.V1 (B.1.1.7 #b117) & 501Y.V2.

The S:E484 build has also been updated. Includes 501Y.V3 & 20B/S.484K (predominantly in Brazil).

1/16

https://t.co/3bdttjKVl4


There are 161 new, non-UK sequences in 501Y.V1 (B.1.1.7) from the Netherlands, Denmark, Australia, Spain, Norway, Germany, the USA, & Switzerland, and from Turkey and Ecuador for the first time.

2/16


Turkey has 19 sequences in 501Y.V1 for the first time. These indicate many independent introductions, though a few clusters may indicate local transmission, and pairs with common exposure.

3/16


Ecuador has 4 sequences in 501Y.V1 for the first time, which represent 2 separate introductions (pic 2). 3 are identical, and may represent exposure to a common source (pic 3). The connection to the Spanish sequence may be a common source, or onward transmission.

4/16


Denmark has 66 new sequences (orange). A few are independent introductions, though many link with older sequences, showing continuing local transmission.

5/16
SOCIETY
Dr Emma Hodcroft
Dr Emma Hodcroft
@firefoxx66
The latest S:N501 focal build is now up, with data from 28th Dec:

We can see new sequences from Italy, Israel, Spain, France, & Ireland in the SE England variant (501Y.V1) & Switzerland in the South African variant (501Y.V2).

1/8

https://t.co/PEU7dhptO6


In 501Y.V1 (SE England variant), we can see 1 new sequence from France & Spain, each. The French sample has a travel history to the UK.

3 new sequences are from Israel (marked 1 & 2). Zooming in on '2' (divergence view) shows they are identical, indicating 1 introduction.

2/8


There are 7 new sequences from Ireland, found roughly in 5 places on the tree (4 are singletons, 3 cluster together - 2nd 'group' from the top).

These indicate at least 5 introductions, but we need to zoom in on the 3 that cluster to see more clearly.

3/8


Zooming in to the 3 that cluster together (divergence view), shows it can be difficult to distinguish introductions sometimes, especially as we expect strong travel links between the UK & Ireland, & may only be sampling the total diversity present in Ireland.

4/8


14 new sequences from Italy are scattered across the tree - some alone & some clustering.

Zooming in on a few clusters shows some seem to be linked, while others are harder to determine.
4 seem to be clearly linked as 1 introduction.

5/8
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Dr Emma Hodcroft
Dr Emma Hodcroft
@firefoxx66
The S:N501 build is now updated with data from 25th Jan.

Remember, you can always check on any country by just typing that country name in the 'Filter' box on the left menu!

1/18

https://t.co/FTjvV7T7wL


In the 501Y.V1 (B.1.1.7) variant, here are a few of the non-UK countries with new sequences in this variant, including Denmark, Italy, Spain, France, Portugal, Norway, Germany, the USA, South Kora, & Switzerland, & the UAE, Austria, & Czech Republic for the 1st time

2/18


Denmark has 52 new samples (some yellow), showing both separate introductions and further spread of existing local clusters.

3/18


Spain has 62 new sequences (orange & yellow). Many of these are separate introductions, and a few new sequences form distinct clusters. Some new sequences also cluster closely with older sequences (green).

4/18


France has 72 new sequences (orange & yellow). These show both separate introductions and clustering with older sequences.

5/18
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He destroyed so many villages, killed villagers to torture Chhatrapati Shivaji.

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MUST READ TILL END:
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IAS-1976(BIHAR)
" Received a hurtful post from an old friend and colleague. He was on my daily Broadcast list of WhatsApp. He requested that I do not send him any of my posts on 'political' issues. I gave him a long explaination
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on why I write and what I write. But he was not convinced.

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Similarly, I have no views whether BJP is a better party than Congress or vice versa.
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1. Ever since the beginning of my service I realised that Planning Commission was not serving..

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The RV and the Redemption Funds.

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