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

Each day brings new challenges, but here's an update to the dedicated S.N501 build, using data from 6 Jan 2021 to keep you going.

There are 42 new non-UK sequences in 501Y.V1 (B.1.1.7) & 7 new non-South-African sequences in 501Y.V2.

1/14

https://t.co/kT1gFsSZn0


There are 42 new non-UK sequences in 501Y.V1 from the Netherlands, Italy, Hong Kong, Finland, Sweden, Germany, USA, Switzerland, Brazil, and the first sequence from 501Y.V1 in Oman.

https://t.co/XA8VR8HiEq

2/14


Oman has their first sequence which falls into 501Y.V1:

3/14


Finland has 12 new sequences (orange), which mostly represent separate introductions. Zooming in (divergence view), we can see 3 of the new sequences are identical (red), which may indicate the cases are connected.

4/14


Sweden has 8 new sequences (orange), which indicate separate introductions.

5/14
🎉Happy New Year!🎉

To kick off 2021, here's an update on:
- S:N501 variants (501Y.V1/V2) with data from 31 Dec 2020
- 69/70del variants
- 20A.EU1 variant (most prevalent variant in Europe)

(Here are some fireworks that look a bit like phylogenies! 🎆)

1/23


The latest sequences from 31 Dec show new sequences in the S:N501Y.V1 variant (originating from SE England) from Netherlands, Denmark, Australia, Italy, Canada, the USA, Germany, Switzerland, & India.

2/23

S:N501 link
https://t.co/TfHfPgBEBS

Image link
https://t.co/3aCKv1pAcI


Canada, Germany, & Switzerland all have sequences that fall in 501Y.V1 for the first time, scattered across the tree.

3/23


The USA also has its first 2 sequences that fall in 501Y.V1, from Colorado & California. India also had its first 3 sequences, also from different regions.

In both cases, the sequences are not connected, indicating separate introductions.

4/23


In countries with previous sequences:

6 new sequences from Netherlands, in orange/yellow (green are older).
1 is clearly separate - zooming in (& in divergence view, coloured by country) it is harder to determine the relationship between the others.

5/23

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