# Selection of RSV reference sequences

**URL:** <https://nextstrain.discourse.group/t/selection-of-rsv-reference-sequences/1655>\
**Category:** Uncategorized\
**Created:** [May 22, 2024, 10:12pm UTC](https://nextstrain.discourse.group/t/selection-of-rsv-reference-sequences/1655 "2024-05-22T22:12:03Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Thomas](https://avatars.discourse-cdn.com/v4/letter/t/e36b37/32.png) [@Thomas](https://nextstrain.discourse.group/u/Thomas)\
**Post date:** [May 22, 2024, 10:12pm UTC](https://nextstrain.discourse.group/t/selection-of-rsv-reference-sequences/1655/1 "2024-05-22T22:12:03Z")

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Hi all,

I was wondering how the reference sequences for RSV-A and RSV-B in nextclade were selected. Were there any special considerations when picking EPI\_ISL\_412866 for RSV-A? I’m assuming a more recent sequence with high-quality was selected, but not sure if there were other considerations.

Best,  
Thomas

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**Author:** ![rneher](https://yyz1.discourse-cdn.com/flex031/user_avatar/nextstrain.discourse.group/rneher/32/20_2.png) [@rneher](https://nextstrain.discourse.group/u/rneher)\
**Post date:** [May 23, 2024, 4:25pm UTC](https://nextstrain.discourse.group/t/selection-of-rsv-reference-sequences/1655/2 "2024-05-23T16:25:09Z")

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Hi Thomas,

these are the reference sequences suggested by GISAID. Since RefSeq reference were very old, we chose these instead.

hope this answers your question.  
richard

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**Author:** ![Thomas](https://avatars.discourse-cdn.com/v4/letter/t/e36b37/32.png) [@Thomas](https://nextstrain.discourse.group/u/Thomas)\
**Post date:** [May 23, 2024, 6:09pm UTC](https://nextstrain.discourse.group/t/selection-of-rsv-reference-sequences/1655/3 "2024-05-23T18:09:23Z")

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Yes, that answers it, thank you!