Covid-19: Why the Delta Variant is the Most Disruptive So Far

Bloomberg Quicktake: Now published this video item, entitled “Covid-19: Why the Delta Variant is the Most Disruptive So Far” – below is their description.

What makes delta the most disruptive variant of Covid-19? As the coronavirus sweeps across the globe in relentless waves, a succession of more-infectious strains has washed up. So far delta, the variant first reported in India in October, is the most worrisome. About twice as transmissible as the original virus that emerged in late 2019, delta combines a multitude of genetic features that have enabled it to pierce public-health defenses to stoke severe epidemics and trigger fresh rounds of movement restrictions or delay planned easings of them.

Why is delta worse than other strains?

It’s the most infectious variant of SARS-CoV-2, the coronavirus that causes Covid, to emerge yet — about 55% more transmissible than alpha, the previously most-infectious form, and almost twice as contagious as other circulating strains. The World Health Organization expects delta to rapidly outcompete other coronavirus variants and become the dominant strain of SARS-CoV-2 globally in coming months.

What makes delta more transmissible?

It’s not entirely clear, but it’s thought that the variant replicates faster within those harboring it and may be expelled in larger volumes by them. Delta has also been associated with an increased incidence of Covid in younger patients, who may be more socially mobile and less likely to have been immunized.

What’s different about it?

The variant carries a genetic mutation that helps it to bind more easily to ACE2, a protein on some human cells, potentially enabling it to cause infections more readily. Concentrations of virus particles, or viral loads, in the airways of individuals recently infected with delta were about 1,200 times greater than in those infected with the original coronavirus strain, a study in China found. The research, released without pre-publication review by experts in the same field, also noted that delta was detectable in patients four days after picking up the virus — two days sooner than was previously observed, indicating the strain replicates faster and may make individuals more infectious during the early stages of infection. A short incubation period may make it more difficult to prevent outbreaks by tracing the contacts of infected people and requiring them to quarantine, a strategy relied on heavily by countries such as China and Australia; a shorter incubation makes it more difficult to identify contacts before they are themselves infectious.

Is delta more likely to infect those already immune?

Delta appears better at evading the immunity gained from either immunization or a previous coronavirus infection. It also appears less responsive to some of the antibody therapies used to treat Covid. The reduction in the effectiveness of vaccines against Covid caused by delta may vary by inoculation. For example, the shot made by Pfizer Inc. and its partner BioNTech SE appeared to be more effective than AstraZeneca Plc’s in a study from England published in the New England Journal of Medicine in July. A full course of most vaccines, though, provides strong protection against severe illness and death. Recent modeling from Germany found the continued use of face masks and testing would considerably reduce the chance of a further surge in infections.

How prevalent is delta?

Delta has spread rapidly, turning up in about a dozen new countries each week in July and reaching 124 nations as of July 18. It’s now the dominant strain in the U.S., U.K., Russia, China and at least 10 other nations.

Bloomberg Quicktake: Now YouTube Channel

Got a comment? Leave your thoughts in the comments section, below. Please note comments are moderated before publication.

About This Source - Bloomberg QuickTake: Now

Bloomberg L.P. is a privately held financial, software, data, and media company headquartered in Midtown Manhattan, New York City.

It was founded by Michael Bloomberg in 1981, with the help of Thomas Secunda, Duncan MacMillan, Charles Zegar, and a 12% ownership investment by Merrill Lynch.

Recent from Bloomberg QuickTake: Now:

  • Ford Adds 450 Jobs to Meet Demand for F-150 Lightning Electric Truck
  • Biden Tells World Leaders ‘Time Is Now’ To Boost Climate Pledges
  • Bronze Statue Honoring Bitcoin Founder Unveiled in Hungary
  • In This Story: AstraZeneca

    AstraZeneca plc/AB (LON: AZN) is a British-Swedish multinational pharmaceutical and biopharmaceutical company with its headquarters in Cambridge, United Kingdom and Södertälje, Sweden. Its R&D is concentrated in Cambridge in United Kingdom, Södertälje in Sweden, and Maryland and Toronto in North America.

    3 Recent Items: AstraZeneca

  • Queensland’s ‘Super Vaccination Weekend’ kicks off | 7NEWS
  • Booster Covid vaccines to be offered to over 50s to smooth ‘bumpy’ winter
  • High demand for Pfizer vaccine sees fewer Sydneysiders come forward for AstraZeneca | 7NEWS
  • In This Story: COVID-19

    Covid-19 is the official WHO name given to the novel coronavirus which broke out in late 2019 and began to spread in the early months of 2020.

    Symptoms of coronavirus

    The main symptoms of coronavirus are:

    • a persistent new cough (non productive, dry)
    • a high temperature (e.g. head feels warm to the touch)
    • shortness of breath (if this is abnormal for the individual, or increased)

    Latest News about Covid-19

    Below are stories from around the globe related to the 2020 outbreak of novel Coronavirus – since the WHO gave the Covid-19 naming. Most recent items are posted nearest the top.

    5 Recent Items: COVID-19

  • White House COVID-19 Response Team and federal public health officials hold a press briefing
  • ‘Very controversial’: Putin votes online from isolation after Covid-19 contact • FRANCE 24
  • France Covid-19 protests: French hospital worker goes on hunger strike amid vaccine controversy
  • Bangkok’s taxi graveyard garden: Covid-hit cabbies turn to growing vegetables • FRANCE 24
  • International Day of Peace Youth Observance 2021
  • In This Story: Germany

    Germany, officially the Federal Republic of Germany, is a country in Central and Western Europe. It lies between the Baltic and North seas to the north, and the Alps to the south.

    Germany is a federal parliamentary republic led by a chancellor. With over 83 million inhabitants of its 16 constituent states, it is the second-most populous country in Europe after Russia, as well as the most populous member state of the European Union. Its capital and largest city is Berlin, and its financial centre is Frankfurt; the largest urban area is the Ruhr.

    5 Recent Items: Germany

  • German elections: Who is favourite to be Chancellor?
  • Germany Decides: CEO Briefing
  • The Story of Taiwo Awoniyi – From FC Liverpool to Union Berlin’s Top Striker
  • Germany’s COVID vaccination rate stagnates at 62% | DW News
  • Australian wildfires released more CO2 than annual emissions of Germany, say scientists
  • In This Story: India

    India, officially the Republic of India, is a country in South Asia. It is the second-most populous country, the seventh-largest country by land area, and the most populous democracy in the world. New Delhi is the capital.

    It has an exceptionally diverse population, with Hindus, Muslims, Christians, Sikhs, Buddhists, Jains and other religions speaking over 21 recognised languages.

    2 Recent Items: India

  • Prince William Earthshot Prize could go to 14-year-old girl who invented solar-powered ironing cart
  • Teenager breaks world record for quickest ‘limbo skate’
  • In This Story: Pfizer

    Pfizer Inc. (NYSE: PFE) is an American multinational pharmaceutical corporation headquartered in New York City. In 2012, it was one of the world’s largest pharmaceutical companies and ranked 57 on the 2018 Fortune 500 list of the largest United States corporations by total revenue.

    5 Recent Items: Pfizer

  • Migrant crisis at Texas border l On Location
  • FDA holds meeting on Pfizer booster shoot
  • Cramer: I wouldn’t be a seller of Pfizer, Moderna
  • From Pfizer to Comirnaty: Why are there new names for COVID-19 vaccines in Canada?
  • Emory’s Dr. Carlos Del Rio on the likelihood of the FDA approving the Pfizer booster shot
  • In This Story: Russia

    Russia, or the Russian Federation, is a transcontinental country located in Eastern Europe and Northern Asia. It extends from the Baltic Sea in the west to the Pacific Ocean in the east, and from the Arctic Ocean in the north to the Black Sea and the Caspian Sea in the south.

    Russia spans more than one-eighth of the Earth’s inhabited land area, stretching eleven time zones, and bordering 16 sovereign nations. Moscow is the country’s capital.

    The Soviet Union was dissolved in 1991 and since 1993 Russia been governed as a federal semi-presidential republic. Russia is a major great power, with the world’s second-most powerful military, and the fourth-highest military expenditure. As a recognised nuclear-weapon state, the country possesses the world’s largest stockpile of nuclear weapons.

    3 Recent Items: Russia

  • Donbas veterans mobilised for Russia’s legislative and regional elections • FRANCE 24 English
  • Russia votes in parliament election without main opposition • FRANCE 24 English
  • Russia’s 2021 Parliamentary Elections in full swing
  • In This Story: World Health Organization

    The World Health Organization is a specialized agency of the United Nations responsible for international public health. The WHO Constitution, which establishes the agency’s governing structure and principles, states its main objective as “the attainment by all peoples of the highest possible level of health.”

    3 Recent Items: World Health Organization

  • Dr. Tedros – launch of the WHO/ILO joint report on the work-related burden of disease and injury
  • LIVE: Media briefing with Dr Tedros from Lebanon
  • WHO’s Science in 5 on COVID-19: Mixed and fractional vaccine doses
  • Leave a Comment

    We don't require your email address now, just your name. BUT, if you do add it, you may be notified if there are replies to your comment. Please make respectful comments, which add value, and avoid personal attacks on others. Comments failing to adhere to these guidelines will not be published.