Covids Delta Variant: What We Know

These data have not yet appeared in a scientific publication and some scientists remain skeptical about whether the symptom profile is changing. It is possible for the severity of Covid-19 to vary widely from one person, regardless of which variant.

Angela Rasmussen (virologist at University of Saskatchewan’s Vaccine and Infectious Disease Organization) said last month that she would wait until there is published data before making a decision. Covid is often associated with many symptoms so it’s difficult to know if this is a rare or common occurrence.

Even if the data hold up, it does not necessarily mean that Delta itself causes different symptoms than other variants do. The variant may be more common in young people.

Although there is not yet good data on how all of the vaccines hold up against Delta, two doses of several widely used shots, including those made by Pfizer-BioNTech, Moderna and AstraZeneca, appear to retain most of their effectiveness against the Delta variant, research suggests.

Delta may cause more frequent viral breakthroughs (infections in persons who have been fullyvaccinated) than other variants. However, these infections tend to be mild or asymptomatic. The C.D.C. says vaccines are effective in preventing more than 90% of severe diseases. The document also notes.

Dr. Walensky explained that having your vaccines fully completed gives you high levels of protection against infection and even greater protection against serious illness, hospitalization, and death. “That is what these vaccines were designed for.”

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