World Delta variant 60% more transmissible than Alpha and more vaccine resistant
Here's what we know about the Indian Delta COVID-19 variant detected in Victoria's outbreak
The Delta variant of coronavirus, associated with India and the UK and known to be more infectious than other strains, has been picked up in Victoria through genomic sequencing.Here is what we know about the Delta variant and how it came to be.
The Delta (Indian) variant is about 60% more transmissible than the Alpha (Kent) variant and vaccines are less effective against it, Public Health England has said.
More than 90% of new COVID-19 cases in the UK are now the Delta variant.
The variant, first identified in India, has taken over from the Alpha variant as the most dominant in the UK.
Since last week, the number of Delta variant cases across the UK has increased by 243% to 42,323.
New PHE research suggests the Delta variant is associated with an approximately 60% increased risk of household transmission compared with the Alpha variant.
The Delta strain isn't the only COVID-19 variant you're likely to hear about. Here's a list
The World Health Organization has renamed the different strains of COVID-19 to take on the first four letters of the Greek alphabet.Under the changes, the four most concerning variants take on the first four letters of the Greek alphabet — Alpha, Beta, Gamma and Delta.
And Delta cases are doubling across all regions of the country in between 4.5 days to 11.5 days.
Overall infections in England have risen to the highest since the week to 10 April, with one in 560 people in the week to 5 June compared with one in 640 the week before, latest Office for National Statistics (ONS) figures revealed.
There were 96,800 people in private households in England who were estimated to have had COVID-19 that week, up from 85,600.
In England, 39,061 Delta variant cases have now been confirmed, with 2,035 in Scotland, 184 in Wales and 43 in Northern Ireland.
PHE said the large increase from 12,341 last week to 42,323 this week has been partly driven by faster test turnaround times and a quicker process for identifying cases of the variant.
How the coronavirus Delta variant rampaged through India before spreading across the globe
As Delta rampaged through India undetected, doctors were confounded by the sheer scale of the virus's spread. This is how the COVID-19 variant fuelled a calamitous surge in cases before slipping beyond the country's borders.Daily confirmed infections were in the low hundreds and serological surveys, which detect COVID-19 antibodies in the blood, suggested more than half the city's population had been infected after overcoming three surges.
The latest COVID-19 risk assessment by PHE reports the Pfizer and AstraZeneca vaccines are less effective against the Delta variant than the Alpha one by 17% after one dose.
But there was little reduction in efficacy after two, meaning getting a second dose is integral to protection against the Delta variant.
The PHE authors said: "This would support maximising vaccine uptake with two doses among vulnerable groups."
As of 7 June, there have been 42 deaths in England of people confirmed as having the Delta variant and who died within 28 days of testing positive.
Of these people, 23 were unvaccinated, seven had had their first dose more than 21 days before and 12 had their second dose more than 14 days before.
Biden Says It's 'Unlikely' Delta Variant Will Cause U.S. Lockdown but Won't Rule It Out .
"The existing vaccines are very effective so no, it's not a lockdown, but some areas will be very hurt," the president said."I don't think so, because so many people have already been vaccinated," Biden said at a press conference when asked if the variant could prompt a new shutdown nationally. "But the Delta variant can cause more people to die in areas where people have not been vaccinated. Where people have gotten the two shots, the Delta variant is highly unlikely to result in anything.