New studies in France show fresh evidence that the most widely used vaccines against coronavirus offer strong protection against the Delta variant, which is spreading rapidly around the world and is now the most prevalent in the United States.
Delta is increasing in populations with low vaccination rates. On Thursday, Dr. Rochelle Walensky, director of the US Centers for Disease Control and Prevention (CDC), said that is leading to “two truths”: Sections of the country with high immunization rates are making a comeback. to normal, while hospitalizations increase elsewhere.
“That rapid growth is worrying.”, He said. A few weeks ago the delta variant accounted for just a quarter of new cases, but now it represents more than 50% and in some places, such as parts of the center of the country, up to 80%.
Scientists at the Pasteur Institute in France on Thursday reported new evidence that lFull vaccination is key.
The application of the AstraZeneca vaccine in Nigeria. AP Photo
In laboratory tests, the blood of people who had received the first dose of the Pfizer or AstraZeneca vaccines “barely inhibited” the Delta variant, the team reported in the journal Nature, but weeks after receiving the second dose, almost all had what scientists consider an immune booster enough to neutralize that variant, although the protection was slightly less powerful than against previous versions of the virus.
French scientists also studied unvaccinated people who had survived COVID-19 and found that their antibodies were four times less potent against the new variant, but that a single dose of the vaccine greatly strengthened their immune response, unleashing general protection against the delta variant and two other mutations, the study says. That supports the recommendation that COVID-19 survivors should be vaccinated rather than relying on their natural immunity.
Laboratory experiments add to data derived from real life indicating that the Delta variant of the virus you are not evading the most widely used vaccines in the western worldBut they stress that it is crucial that more people get vaccinated before the virus evolves further and can become more resistant.
Researchers in Britain found that two doses of Pfizer’s vaccine, for example, protect 96% against hospitalization and the delta variant and that they are 88% effective against symptomatic infection. Last week, Canadian researchers also came up with that finding, while a report from Israel indicates that protection against mild infection caused by the delta variant may have been further reduced, to 64%.
The question remains whether fully vaccinated people they must still wear masks in places where the delta variant arises. In the United States, the CDC says no. Even before the delta variant appeared, vaccines weren’t perfect, but evidence indicates that if vaccinated people become ill they will have much milder symptoms.
“Let me emphasize: if you are vaccinated you have a very high degree of protection ‘‘Dr. Anthony Fauci, America’s leading infectious disease expert, said Thursday.
The case rate in the United States has been increasing for weeks and the hospitalization rate has started to rise, up 7% compared to the previous seven-day average, Walensky told reporters Thursday. However, the number of deaths remains low on average, which some experts believe is due, at least in part, to the high rate of vaccination in people 65 years of age and older, who are the most susceptible to becoming seriously ill.