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Australia The Delta strain isn't the only COVID-19 variant you're likely to hear about. Here's a list

22:42  07 june  2021
22:42  07 june  2021 Source:   abc.net.au

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Here ' s a quick guide to some of the variants you ' re likely to hear about , ranked in terms of relevance to Australia. The WHO has renamed the multiple different strains of COVID - 19 circulating around the world to make them easier to understand. Under the changes, the four most concerning variants take on the first four letters of the Greek alphabet — Alpha, Beta, Gamma and Delta .

Here are some of the most common questions you have about it. How contagious is the Delta variant of COVID - 19 ? It' s far more infectious than the virus we were dealing with last year. In the United Kingdom the Delta variant only emerged in April, but it has quickly taken over as the dominant form of the virus there. "Compared to the original strain , the Delta strain is two times more contagious," said Professor Stuart Turville, a virologist from the Kirby Institute. The "secondary attack rate", or the number of people who are likely to be infected if they come into contact with an infected person, is also higher.

The WHO has renamed the multiple different strains of COVID-19 circulating around the world to make them easier to understand.

Under the changes, the four most concerning variants take on the first four letters of the Greek alphabet — Alpha, Beta, Gamma and Delta.

Those were previously known as the UK variant, the South African variant, the Brazilian variant and the Indian variant.

Here's a quick guide to some of the variants you're likely to hear about, ranked in terms of relevance to Australia.

Delta, the Indian variant

The Delta variant is the most recently designated variant of concern, as classified by the World Health Organization (WHO).

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His mask-free nation is hovering at zero Covid deaths per day. Anders Tegnell said on Friday that there was “a lot we do not know” about Delta and cautioned against drawing “far-reaching conclusions” about the coronavirus strain . He noted that the variant had been circulating in Sweden “for quite His comments were made in response to newly released data from the Centers for Disease Control and Prevention (CDC) suggesting the Delta strain is more transmissible and could potentially cause more severe illness. The New York Times and other media outlets ran stories reporting that the CDC now

That means it's one of the four variants most concerning to global health authorities because it's believed to show:

  • Increased transmissibility or detrimental change in epidemiology
  • Increased virulence or change in disease presentation
  • Decreased effectiveness of prevention and control measures

It was first detected in India in October last year, and is considered highly contagious.

UK authorities have estimated it's 40 per cent more transmissible than an earlier variant that sent Britain into lockdown at the start of the year.

It's been detected in one of two active clusters in Victoria but its source has not been conclusively found.

Its other names include B.1.617.2 and the Indian variant — although there's more than one of those.

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You are still less likely to get infected - but if you do, you will have similar levels of virus as someone who hasn' t been vaccinated at all." The message from Walker and her team at Oxford was clear: Vaccination remains the best way to protect against infection, and certainly against serious illness or hospitalization with COVID - 19 , including the Delta variant . None of the coronavirus vaccines approved for use in the U. S . or U.K. thus far eliminate the risk of infection, but they all reduce that risk by between about 70% and 90% — and they've proven much more potent at preventing hospitalizations and

In a study of 469 cases of Covid - 19 that broke out in the resort town of Cape Cod, Massachusetts, earlier this month, 74% occurred in “fully vaccinated persons.” Four out of five patients hospitalized were fully vaccinated, and on average the inoculated had completed their two rounds of doses only Some 79% of vaccinated patients were symptomatic, the study noted. Lab testing revealed that 90% of all the Cape Cod infections involved the Delta variant of the coronavirus. The report lends weight to the argument that the current crop of vaccines aren’ t as effective against the Delta variant , although the

Kappa, the other Indian variant

The Kappa variant is the one behind most of the cases in Victoria.

It likely entered the Victorian community via a man who became infected in hotel quarantine in Adelaide before travelling to Victoria.

It was also first detected in India, but unlike the Delta variant it's not listed as a variant of concern.

Instead, the WHO treats it as a variant of interest. However, it is still highly contagious and potentially deadly.

"[It] is starting to show up in places where normally it would be less likely," Victoria's Chief Health Officer Brett Sutton said of the strain.

Its other name is very similar to the Delta variant: B.1.617.1.

That's because they originated from the same strain: B.1.617

Alpha, the UK variant

The name of this strain, Alpha, reflects the fact it was the first to be designated a variant of concern by the WHO.

It was first detected in September 2020 and was designated a strain of particular concern in December.

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The Delta variant is here . First identified in India, this more transmissible form of the novel coronavirus has spread to at least 77 countries and regions and now makes up more than 20 percent of all U. S . cases. The Centers for Disease Control and Prevention has identified it as a “ variant of concern.” Meanwhile a single dose of the AstraZeneca vaccine was only 71 percent effective against hospitalization caused by Delta (a single dose of Pfizer was still 94 percent effective), and one shot of either vaccine was only about 33.5 percent effective against symptomatic COVID from that variant

Delta variant has drawn focused attention during the past month due a rapid increase in COVID - 19 cases in several countries, including the U. S . The U. S . classifies them as either a “ variant of interest,” which may lead to outbreaks but isn ’ t widespread in the country; a “ variant of concern,” which shows evidence of increased transmission and more severe disease; or a “ variant of high consequence,” which makes vaccines and treatments much less likely to work well.

It was estimated to be at least 50 per cent more transmissible than the first detected strains of COVID-19.

It was behind the UK lockdown in January. However, it is no longer the most dominant strain there — the Delta variant is.

The Alpha strain was also behind a public health response that led to a snap lockdown in Brisbane earlier this year.

It's been known as the UK variant, the Kent variant and B.1.1.7.

Beta, the South African variant

The South African variant, now known as the Beta variant, is the oldest of the COVID-19 variants of concern, having been first detected in May 2020, more than a year ago.

Also known as B.1.351, it was first detected in South Africa.

According to the US Centres For Disease Control, it shares some of the same mutations as the Alpha strain.

Gamma, the Brazilian variant

This strain, the last of the four listed as a variant of concern by the WHO, was first detected in Japan, in travellers from Brazil.

The strain has raised concerns because it may have been responsible for a surge in cases in Manaus, Brazil, where the population was thought to have reached herd immunity.

The strain is also known as P1 and was first detected in November 2020.

How COVID vaccines work against the Delta variant .
Here is what you need to know about the efficacy of coronavirus vaccines against the variant first identified in India.However, there is evidence that the available jabs retain important effectiveness against it after two doses.

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