Covid- U.S. officials keep close watch on the 'delta plus' mutation as it spreads in the U.K.
- 3 years ago
U.S. health officials are keeping a close eye on an emerging Covid-19 subvariant, dubbed “delta plus,” that some scientists say may be more contagious than the already highly transmissible delta variant.
Formally known as AY.4.2, delta plus includes two new mutations to the spike protein, A222V and Y145H, which allow the virus to enter the body. Those mutations have been found in other Covid variants, so it’s unclear how dramatically those changes affect the virus.
Francois Balloux, director of the Genetics Institute at University College London, said it could be 10%-15% more contagious than delta, which first appeared in India and spreads easier than Ebola, SARS, MERS and the 1918 Spanish flu, according to the Centers for Disease Control and Prevention.
Delta has an R-naught, or reproductive rate, of eight or nine, according to CDC Director Dr. Rochelle Walensky, meaning that every person who has Covid will spread it to up to nine other people. The “wild type” or original strain of Covid had an estimated R-naught of about three. Someone infected with the delta variant carries 1,000 times the viral load of the original Covid strain.
India’s Ministry of Health reported in June that delta plus was more transmissible than the delta variant, adding that the subtype binds more strongly to lung cell receptors and could even reduce the effectiveness of monoclonal antibody treatments.
The mutation has been detected in the U.S., but there hasn’t been a noticeable uptick in delta plus cases nationwide, Walensky said at a White House Covid briefing Wednesday.
“We particularly monitor for sublineages that could impact therapeutics, such as monoclonal antibodies and vaccines,” Walensky said. “At this time, there is no evidence that the sublineage AY.4.2 impacts the effectiveness of our current vaccines or therapeutics.”
The AY.4.2 subvariant has been detected in at least five cases in the U.S. since August: in Washington, D.C., California, North Carolina, Washington state and Massachusetts, according to Outbreak.info. The website collects data from GISAID, a global genomic database on Covid and influenza cases.
Top health authorities have cautioned for weeks that more powerful and potentially vaccine-resistant Covid variants could develop as long as widespread outbreaks continue to occur, fueled by billions of people worldwide who remain unvaccinated. White House chief medical advisor Dr. Anthony Fauci said in August that the U.S. could be “in trouble” if another mutation surpassed delta, asking the unvaccinated to get their shots in hopes of curbing a surge that crushed the nation’s health-care systems this summer.
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#covid18
#deltaplusvarant
Formally known as AY.4.2, delta plus includes two new mutations to the spike protein, A222V and Y145H, which allow the virus to enter the body. Those mutations have been found in other Covid variants, so it’s unclear how dramatically those changes affect the virus.
Francois Balloux, director of the Genetics Institute at University College London, said it could be 10%-15% more contagious than delta, which first appeared in India and spreads easier than Ebola, SARS, MERS and the 1918 Spanish flu, according to the Centers for Disease Control and Prevention.
Delta has an R-naught, or reproductive rate, of eight or nine, according to CDC Director Dr. Rochelle Walensky, meaning that every person who has Covid will spread it to up to nine other people. The “wild type” or original strain of Covid had an estimated R-naught of about three. Someone infected with the delta variant carries 1,000 times the viral load of the original Covid strain.
India’s Ministry of Health reported in June that delta plus was more transmissible than the delta variant, adding that the subtype binds more strongly to lung cell receptors and could even reduce the effectiveness of monoclonal antibody treatments.
The mutation has been detected in the U.S., but there hasn’t been a noticeable uptick in delta plus cases nationwide, Walensky said at a White House Covid briefing Wednesday.
“We particularly monitor for sublineages that could impact therapeutics, such as monoclonal antibodies and vaccines,” Walensky said. “At this time, there is no evidence that the sublineage AY.4.2 impacts the effectiveness of our current vaccines or therapeutics.”
The AY.4.2 subvariant has been detected in at least five cases in the U.S. since August: in Washington, D.C., California, North Carolina, Washington state and Massachusetts, according to Outbreak.info. The website collects data from GISAID, a global genomic database on Covid and influenza cases.
Top health authorities have cautioned for weeks that more powerful and potentially vaccine-resistant Covid variants could develop as long as widespread outbreaks continue to occur, fueled by billions of people worldwide who remain unvaccinated. White House chief medical advisor Dr. Anthony Fauci said in August that the U.S. could be “in trouble” if another mutation surpassed delta, asking the unvaccinated to get their shots in hopes of curbing a surge that crushed the nation’s health-care systems this summer.
#Coronavirus
#Coronavirus
#scmp
#covid18
#deltaplusvarant