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To add to the excitement of your Saturday evening, the focal S:N501 build is now updated with data from 8th Jan, including 48 new seqs in 501Y.V1 (B.1.1.7 #b117) & 501Y.V2.

1/12

https://t.co/AbdhO1rqpw

 There are 46 new non-UK sequences in 501Y.V1, from the Netherlands, Italy, Israel, Ireland, Norway, Sweden, the USA, and Luxembourg.
And 2 new non-South African sequences in 501Y.V2, from Australia for the first time.

2/12
In 501Y.V1:

Ireland has 4 new sequences (orange). 2 sit separately but are identical, indicating an additional introduction. 2 link to a previous sequence (green), 1 mutation away each. This could indicate location transmission, unsampled diversity, or a common exposure.

3/12
The Netherlands has 10 new seqs (orange). Many sit apart on the tree, indicating additional introductions. 3 cluster together separated by a few mutations. 2 are identical to an older seq. 1 falls in a cluster of older seqs. Some of these could indicate local transmission.

4/12
Israel has 22 new sequences (orange). 1 links to an older sequence, but is separated by 3 mutations, so may be separate introductions. Another is identical to an older sequence. But most new sequences cluster together (blue), clearly indicating local transmission.

5/12
Norway has 3 new sequences (orange). 2 cluster together but differ by 1 mutation, making their relationship hard to confidently infer. The other sits separately and indicates an independent introduction.

6/12
Italy has 2 new sequences (orange). Zooming in (divergence view) we can see they are identical (yellow), so are likely a single introduction.

7/12
The USA has 2 new sequences, from Connecticut (orange). They sit separately from each other & other USA sequences on the three, indicating independent introductions.

8/12
Luxembourg has 2 new sequences (orange). They sit apart on the tree, indicating separate introductions.

Sweden has 1 new sequence (orange). It sits separately, indicating an additional introduction

9/12
In 501Y.V2:

Australia has sequences that fall into 501Y.V2 for the first time. Zooming in (divergence), we can see they are identical, indicating one introduction.

10/12
As always, the S:N501 "reduced UK" build is updated, & the country-graphs are also updated - remember: many places are preferentially sequencing S:N501 (hot pink), so the frequencies shown may not accurately reflect the true proportion of S:N501!

11/12

https://t.co/c7wlQOLRiq
Finally, the main CoVariants SARS-CoV-2 Variant Tracking page is updated with new links & a new section for S:E484 - but as always, I welcome Pull Requests & Issues in the repository, with papers or online resources I've missed!

12/12

https://t.co/6qBdWhREtl

More from Dr Emma Hodcroft

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
FOR LATER READ
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
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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
WORLD
Dr Emma Hodcroft
Dr Emma Hodcroft
@firefoxx66
A brief update to the focal S:N501 builds to start your Friday off right! This one includes data from 7 Jan 21.

We have about 20 new sequences each in 501Y.V1 (B.1.1.7 #b117) & 501Y.V2.

Let's take a look at the new sequences, starting with 501Y.V1

1/14

https://t.co/kT1gFsSZn0


There are 22 new non-UK sequences in 501Y.V1, including for the first time from Luxembourg (3), & additional seqs from Singapore (1), Australia (4), France (12), & Switzerland (2).

2/14


First, Luxembourg has 3 sequences in 501Y.V1 for the first time. Each represents a separate introduction.

3/14


France has 12 new sequences (orange). Many of these represent independent introductions.

Zooming in (divergence view), we can see 2 new sequences are identical (possible local transmission), & 2 differ by 2 mutations (1 each).

4/14


Australia has 4 new sequences (red and orange) which are spread across the tree, representing separate additional introductions.

5/14
FOR LATER READ
Dr Emma Hodcroft
Dr Emma Hodcroft
@firefoxx66
The focal S:N501 build is now updated with data from 13 Jan!

There are a total of 247 non-UK & non-South African sequences in 501Y.V1 (B.1.1.7 #b117) & 501Y.V2.

I'll do an additional thread later on, covering S:E484 & the 'Ohio variants'.

1/18

https://t.co/3bdttjKVl4


There are 244 new sequences in 501Y.V1 (B.1.1.7) from Australia, Belgium, Denmark, Germany, India, Israel, Italy, Netherlands, New Zealand, Norway, Portugal, Singapore, Spain & USA, as well sequences as from Ecuador and Greece for the first time.

2/18


Greece has 3 new sequences in 501Y.V1 for the first time. They indicate 2 separate introductions.

Ecuador has 2 sequences for the first time. They also indicate 2 separate introductions.

3/18


The USA has 61 new sequences (orange), from Florida, Minnesota, California, Pennsylvania, & New York.

A few of these represent separate introductions. Others form distinct clusters that may indicate ongoing local transmission.

4/18


Israel has 35 new sequences (orange). Some of these show separate introductions, but many link with older sequences, indicating ongoing local transmission.

5/18
SOCIETY

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