12/20/2023 0 Comments Delta variant originData from an app that more than 4 million people in the U.K. have reported a shift in symptoms that may be associated with the delta variant. Alejandro Perez-Trepichio, an internal medicine physician based in Naples, Florida. variant and now the delta one, we are noticing that there is a difference in transmissibility, as well as the potential for more dangerous outcomes,” said Dr. ![]() “If for comparison we look at the original strain, the U.K. The researchers found that the risk of hospitalization from Covid-19 was roughly doubled for patients infected with delta, compared with people infected with the alpha variant. A study published June 14 in the journal The Lancet examined the impact of the delta variant in Scotland, where it had become the dominant strain. More research is needed, but there are indications that the delta variant may cause more severe disease. Does the delta variant cause more severe illness or symptoms? It's not yet clear, however, if delta plus carries additional risks or is associated with increased transmissibility. In India, researchers observed mutations separate from delta in a sublineage of the virus that they dubbed “delta plus.” While it has not yet been designated a variant of concern by the WHO or the CDC, cases involving delta plus have been reported in 11 countries, including the U.S. It’s not unusual for a virus to mutate and evolve as it spreads, and scientists have long cautioned that other worrisome variants could emerge with new outbreaks. So in this case, you would expect 7.5 of those contacts to be infected, after accounting for vaccination status and whether they had a previous infection.” What is the "delta plus" variant? If a second variant is 50 percent more transmissible, that number would be 50 percent higher. “With one variant, maybe you see five of those close contacts get infected. David Dowdy, an associate professor of epidemiology at the Johns Hopkins Bloomberg School of Public Health. “Let’s say you have 10 people with 20 close contacts,” said Dr. This involves tracking the close contacts of people who have been infected with different versions of the virus and seeing how many others tested positive. One of the ways epidemiologists determine the transmissibility of a new variant is to examine what’s known as the secondary attack rate. Public health officials in the United Kingdom, where delta accounts for more than 95 percent of new Covid-19 cases, have said that the variant could be 40 to 60 percent more transmissible than the alpha variant, though studies are ongoing. Research suggests that delta, officially known as B.1.617.2, is the most contagious of all the known variants to date, including the highly transmissible alpha variant that was first identified in Britain. In the U.S., the CDC declared delta a “variant of concern” on June 15. ![]() ![]() The designation is used when there is increased evidence that a variant is more transmissible, causes more severe illness or reduces the effectiveness of vaccines or treatments. The delta variant was declared a “variant of concern” by the World Health Organization in May. Here is what’s known so far about the delta variant. Anthony Fauci, the nation's leading infectious disease expert and director of the National Institute of Allergy and Infectious Diseases, called the delta variant the “greatest threat” to eliminating Covid-19 in the U.S.
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