“For the greater public, it doesn’t really make a difference. “For a genomic scientist like me, I want to know what variations we’re seeing,” says Kelsey Florek, senior genomics and data scientist for the Wisconsin state public health lab. “If we have evidence a new lineage is more threatening, WHO will give it a new name.” Tracking evolution All the time, we see new variants popping up with no different behavior at all,” says Brito. But we should not be upset by the discovery of new variants.
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“People get quite anxious when they see a new Pango name. It doesn’t mean the virus is more dangerous or more concerning. “Delta plus” takes the WHO designation and mixes it up with Pango’s lineage information. There are currently eight families with Greek letters, but until there’s evidence a new sublineage of the first delta strain is acting differently from its parents, the WHO considers them all to be delta. It gives names to related covid samples if it believes they may be of particular interest. The name delta, meanwhile, comes from the WHO system, which is meant to simplify genomics for the general public.
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There are currently over 1,300 Pango lineages, 13 of which are considered part of the delta family. It doesn’t determine whether new lineages act differently in people, just whether they’re different on a molecular level. It’s meant for researchers tracking small genetic changes to the virus. The alphanumeric system that gave the first delta variant its scientific name-B.1.617.2- is called Pango.
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This naming confusion stems mostly from the way journalists (and their scientist sources) have blended two commonly used systems of tracking covid’s evolution-despite the fact that the approaches have very different strategies and goals. (Now is a good time to note that while some of delta’s mutations make it more transmissible, vaccines are still very good at preventing severe illness from every known strain of covid.) What’s in a name? But a new scientific name doesn’t mean those viruses will act any differently from the branch they grew from-and if one of those new branches does start to change its behavior, it gets a new Greek letter, not a “plus.” When the big branch grows new twigs, which happens all the time, scientists keep track by using technical names that include numbers and letters. Delta is like a thick branch on that tree-a big family of viruses that share a common ancestor and some of the same mutations, which let them spread between people more quickly. It might be helpful to think of covid as a tree. “So far, we have no evidence any of the mutations affect behavior compared to the original delta variant.”
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“The name ‘delta plus’ is completely incorrect, because it gives the perception that this will cause more damage,” says Anderson Brito, a member of the Pango Lineage Designation Committee, which assigns scientific names like B.1.1.7 to new branches of the virus. And many researchers are also really, really hoping you’ll stop saying “delta plus.” Scientists would really like you to understand that there’s no evidence delta has learned any new tricks, and these new names are for helping keep track of covid’s evolution-not nine new reasons to panic. If you’ve been worried by recent news stories about a strain of covid called “delta plus,” it may freak you out to hear that scientists just expanded the delta family from four variants to 13.