On July 29, 2021, in Mevagissey, England, you will see a sign warning that people are away because of Covid-19.
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More than a year after the Covid-19 pandemic, the world is working on highly contagious delta variants, including the United Kingdom and We, For people in Africa and Asia.
According to the World Health Organization, the first delta variant detected in India last October has been found in more than 130 countries around the world.
Delta is the most contagious variant of the coronavirus that first emerged in China in late 2019, said Dr. Maria Vankelhob, epidemiologist and technology leader at WHO Covid-19.
“The virus itself is initially a dangerous virus and a highly contagious virus. The delta type is even more infectious, twice as infectious as its ancestors, and 50% more contagious than the alpha strain. It’s expensive, “she said. At the WHO media briefing last week.
Alpha variant was first detected in the UK
According to data compiled by Johns Hopkins University, the number of Covid-19 cases reported worldwide exceeded 200 million on Wednesday, killing more than 4.2 million people.
Delta is one of four “Variant of concern” Listed by WHO. Such variants are more contagious, are considered more resistant to current vaccines and treatments, or can cause more serious illness.
Delta variants have become the leading strain causing Covid-19 in many countries.
According to a sequenced coronavirus sample collected by GISAID, approximately 65 countries detected Covid cases caused by delta mutations in the four weeks leading up to August 5.
GISAID is a platform for scientists to share information about viruses, whose data is widely used by the global scientific community, including WHO.
Data on the prevalence of Covid delta variants underestimate the reality, as some countries do not share sequenced samples with GISAID and others lack the ability and resources to perform virus sequencing. It may be.
In 55 of those countries, delta variants accounted for more than half of the virus samples submitted, data edited by GISAID showed.
The Covid Delta variant is not immune to countries with some of the highest vaccination rates in the world.
Israel, where more than 62% of the population is fully vaccinated, has reported an increase in daily cases over the past month as Delta has become the country’s dominant strain.
As the Delta variant spread to Israel, the Ministry of Health discovered that: Double dose Pfizer-BioNTech Covid vaccine efficacy Protection against severe illness remained high, but dropped to only 39%.The country has started Manage booster shots For people over 60 years old.
However, in a UK study where delta variants also contributed to the increase in infections, two doses Pfizer—BioNTech Or vaccine by AstraZeneca-Oxford University was almost as effective against Delta as the Alpha version.
the study Published in The New England Journal of Medicine Using real-world data, we found that a double dose of the Pfizer-BioNTech vaccine was 88% effective against the delta mutant. It is compared to 93.7% against Alpha strains, it said.
Studies have shown that the AstraZeneca-Oxford vaccine is 67% effective against the Delta, compared to 74.5% effective against the alpha variant.
However, vaccination progress remains uneven around the world. Many poor developing countries are lagging behind due to lack of access to the Covid-19 vaccine.
on Wednesday, WHO has called on rich countries to stop distributing booster shots, Citing vaccine injustices around the world.
Van Kerkhove of WHO said there are steps that individuals can take to inoculate more people as well as protect themselves from delta variants. That includes wearing a mask, keeping your hands clean, and spending more time outdoors than indoors, she said last week.
“This wouldn’t be the last viral variant we hear talking about,” she added. “Because this is what the virus does, it can become more contagious. As the virus evolves and changes over time, we must do what we can to get rid of it.”
The chart shows how widespread the delta variant is around the world
Source link The chart shows how widespread the delta variant is around the world