Washington: US scientists would gain vastly expanded capabilities to identify potentially deadlier mutations of the coronavirus under Covid-19 relief legislation advancing in Congress.
The US now maps only the genetic makeup of a minuscule fraction of positive virus samples, a situation some experts liken to flying blind, according to an AP report.
It means the true domestic spread of problematic mutations first identified in the United Kingdom and South Africa remains a matter of guesswork.
Such ignorance could prove costly. One worry is that more transmissible forms such as the UK variant could move faster than the nation’s ability to get the vaccine into Americans’ arms, it added.
“You’ve got a small number of academic and public health labs that have been basically doing the genomic surveillance, said David O’Connor, an AIDS researcher at the University of Wisconsin. But there is no national coherence to the strategy.”
The Centers for Disease Control and Prevention is trying to shepherd those efforts, aligning with the government’s own advanced detection work, but the Covid-19 legislation would take the hunt to another level.
A bill cleared for floor debate last week by the House Energy and Commerce Committee would provide USD 1.75 billion for genomic sequencing. It calls for the CDC to organise a national network to use the technology to track the spread of mutations and guide public health countermeasures.
In the Senate, Wisconsin Democrat Tammy Baldwin has introduced legislation that would provide USD 2 billion. Baldwin says the U.S. should be using gene-mapping technology to analyse at least 15 per cent of positive virus samples.
It might not sound like much, but the current rate is believed to be 0.3 per cent to 0.5 per cent. Analysing 15 per cent of positive samples would expand surveillance by at least 30 times.
Variants represent a growing threat, said Baldwin. At the start of the COVID-19 pandemic, increasing our testing capacity was essential to our ability to track and slow the spread of the virus the same is true for finding and tracking these variants.
Genomic sequencing essentially involves mapping the DNA of an organism, the key to its unique features. It’s done by high-tech machines that can cost from several hundred thousand dollars to USD 1 million or more. Technicians trained to run the machines and computing capacity to support the whole process add to costs.
In the case of the UK variant first detected in England, the changes in the virus allowed it to spread more easily and are also believed to cause deadlier COVID-19 disease.
The Institute for Health Metrics and Evaluation in Seattle reports that transmission of the UK variant has been confirmed in at least 10 US states. CDC Director Dr. Rochelle Walensky told governors on Tuesday that it could become dominant by the end of March.
Sequencing 0.3 per cent to 0.5 per cent of virus samples, as the U.S. is now doing, just doesn’t give us the ability to detect strains as they develop and become dominant, said Dr. Phil Febbo, chief medical officer for Illumina, a San Diego-based company that develops genomic sequencing technologies.
The Biden administration has to set a very clear goal, he added. What’s the hill that we are going to charge?
We need that data. Otherwise, in some ways, we’re flying blind, said Esther Krofah, who directs the FasterCures initiative of Milken Institute. We don’t understand the prevalence of mutations that we should be worried about in the U.S.
Even more worrisome than the UK variant is a strain first detected in South Africa that scientists suspect might be at least partly resistant to some of the coronavirus vaccines. That variant has also been identified in the U.S. in a limited number of cases.
White House coronavirus coordinator Jeff Zients has called U.S. tracking of virus mutations totally unacceptable, saying the nation ranks 43rd in the world. But the Biden administration has not set a target for what level of virus gene mapping the country should be striving for.