Delta Variant of Covid: What We Know


Delta was first described in the United States in March. It spread rapidly. In early April, Delta represented just 0.1 percent of cases in the United States. according to HKM. In early May, the variant accounted for 1.3 percent of cases, and by early June that figure had risen to 9.5 percent. The CDC now estimates the number has reached 83.2 percent.

Not yet clear. Dr. “We crave for good data,” Osterholm said.

In England, where the variant is common, reports have surfaced that Delta may cause different symptoms than other variants. Researchers conducting the study Covid Symptom Studyasking people with the disease to report their symptoms in an appThey said that the most common symptoms of Covid are changed because the variant spread to England.

“We noticed last month, we’re seeing different sets of symptoms than we saw in January,” said Tim Spector, a genetic epidemiologist at King’s College London who led the study.

Dr. Headache, sore throat and runny nose are now among the most commonly reported symptoms, with fever, cough and loss of smell being less common, Spector said.

But these data have not yet been published in a scientific journal, and some scientists are not convinced that the symptom profile has actually changed. Regardless of its variant, the severity of Covid-19 can vary wildly from one person to another.

“I’ll wait for published data before I come to a conclusion,” said Angela Rasmussen, a virologist with the University of Saskatchewan’s Vaccine and Infectious Diseases Organization, last month. “The truth is, Covid is often associated with a wide variety of symptoms, so it’s hard to say whether this is truly unusual or anecdotal.”

Even if the data are valid, it does not mean that Delta itself causes different symptoms than other variants. A milder symptom profile may be a result of the fact that the variant primarily infects younger people who are least likely to be vaccinated, or people who already have an immunity to the virus, for example from a previous infection.


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