The CDC estimates that the Delta variant now accounts for 83 percent of all new sequenced COVID cases in the U.S. — up from 50 percent at the beginning of the month. Here's what you need to know about the variant
Pedestrians walk past a sign warning members of the public about the spread of coronavirus in Hounslow, West London, on June 1. Photo: Justin Tallis/AFP via Getty Images The Delta coronavirus variant originally discovered in India last December has now become the most dominant — and worrisome — strain of the coronavirus circulating globally.
There is limited research regarding whether or not the Delta variant causes more severe illness than other variants. According to Public Health England, early data suggests that Delta is more likely to lead to hospitalization than Alpha, but that could be due to increased transmissibility rather than it being more pathogenic. Per the Guardian:
One set of U.K. government research found that two doses of a COVID vaccine provided 81 percent protection against the B.1.617.2 variant . One dose only provided 33 percent protection against symptomatic infection from B.1.617.2 . That means, according to a Financial Times analysis, that a single dose is 35 percent less effective against B.1.617.2 than it is against B.1.1.7.
In a study released in Nature on July 8, French researchers tested unvaccinated people who had survived a bout of COVID-19 in order to study how well antibodies produced by natural infection, as well as vaccines, can neutralize Delta. Antibodies from those who were previously infected did not neutralize Delta very well, but a single dose of Pfizer or AstraZeneca dramatically boosted their antibody levels.
Though hundreds of millions of COVID vaccine shots have been administered in the U.S., full vaccination rates still vary across the country; areas where fewer shots have been administered could feel this highly transmissible strain’s impact. “I’m really holding my breath about the South and what happens over the summer,” Dr. Peter Hotez, co-director of the Center for Vaccine Development at Texas Children’s Hospital, recently told CNBC.
Delta slams Midwest In Missouri, Kansas, Iowa, and Connecticut, Delta represented more than 80 percent of new infections. In Missouri, where vaccination rates are relatively low and the supercharged strain makes up a whopping estimated 96 percent of daily cases, hospitals have been strained for ventilators. “We just never thought we would be back here,” Erik Frederick, chief administrative officer at Mercy Hospital in Springfield, told the Associated Press.
The rapid spread of B.1.617.2 has led the U.K. to attempt to speed up its vaccination campaign, particularly the second doses that many adults in Britain still have not received. Delta has been detected in at least 92 countries, according to the WHO, but has likely spread to more thus far undetected.
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