Jeffrey SoRelle with UT Southwestern Medical Center studies and analyzes the results of COVID-19 tests. He said cataloging different strains helps him provide input on care and treatment for patients with different variants.
鈥楾he Most Sequenced Virus In All Of History鈥�
Finding new coronavirus variants is a group effort. SoRelle said he believes COVID is 鈥渢he most sequenced virus in all of history,鈥� and scientists all over the world upload their sequences for others to view.
鈥淚 can go in and say, in New York, California, the UK, what is the most common variants that they're seeing?鈥� SoRelle said. 鈥淥r what are the most rapidly increasing variants they're seeing? And are we seeing anything like that here in Texas?鈥�
SoRelle said the first thing he identifies when analyzing a variant is whether it is more infectious. He also looks at how the strain is spreading. When at least 20% of cases in an area are one specific variant 鈥� it鈥檚 considered a 鈥渧ariant of concern.鈥� Delta, for example, represents more than 95% of the coronavirus cases SoRelle is tracking.
鈥淎t that point, there are enough cases that we can start looking to see if there are other characteristics, either how it impacts vaccine efficacy or hospitalization rates or mortality in a hospital to then see if it should be more concerning.鈥�
How COVID Variants Have Spread In North Texas Throughout 2021
The first coronavirus variant, alpha, arrived in North Texas at the end of January. It took about three months to become the most prevalent strain. When delta showed up at the end of May, SoRelle said things started to move quickly.
鈥淎t first, we were looking just twice a day during June. Then the number of positives listed got longer and longer. I had to check it more and more times. By the beginning of July, [delta] was the predominant variant,鈥� SoRelle said. 鈥淎lpha was almost entirely gone at that point. Just over very quickly, which is very surprising.鈥�
He said while there are other variants across the globe, delta is outcompeting most of them.
鈥淒elta variant is just so much more infectious than many other variants out there,鈥� SoRelle said. 鈥淚t's hard for them to get a foothold.鈥�
Emerging Variants In North Texas
SoRelle said he and others at UT Southwestern Medical Center are tracking a variant out of South America called lambda, of which there鈥檚 been a few cases so far in Dallas County.
He mentioned he鈥檚 also monitoring a mutation of delta known as 鈥渄elta plus.鈥� It has a mutation in the spike protein of the virus, but SoRelle said the lab has only found one sample of the variant mutation among hundreds of delta specimens.
He鈥檚 also guessing this won鈥檛 be the end of new variants.
鈥淲e've seen five or six different ones this year alone, just the first half of the year,鈥� SoRelle said. 鈥淚t seems entirely likely that if we continue on the same trajectory, that we'll continue to see more variants.鈥�
SoRelle said the best way to slow the virus is for more people to get the vaccine.
鈥淚f you want to stop all these variants from continuing to appear and keep hearing about them, the best way to stop it is to get vaccinated,鈥� SoRelle said.
Got a tip? Email Elena Rivera at erivera@kera.org. You can follow Elena on Twitter .
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