The more transmissible delta variant of the coronavirus is on track to become the dominant form globally, experts tell 快猫短视频. Now detected in at least 85 countries, its spread has triggered new lockdowns and other restrictions across the world.
鈥淚 know that globally there is currently a lot of concern about the delta variant, and the World Health Organization is concerned about it too,鈥� Tedros Adhanom, director-general of the WHO, at a press conference on 25 June.
Data from science analytics company Airfinity records delta as the second most dominant variant of concern globally, a designation used for more transmissible, harmful or vaccine-resistant versions of the virus. At around 80,000 cases detected to date globally, it still lags behind the 1 million detected cases of alpha, the variant of concern first identified in the UK.
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But delta鈥檚 rapid dominance in the UK shows how fast it can spread, even in a country with high vaccination rates. Delta was first detected in the UK in mid-April. It and has delayed the easing of restrictions.
The variant is also spreading fast through Europe. 鈥淚t may become dominant [across Europe] as cases seem to be increasing exponentially,鈥� says Caroline Casey of Airfinity. In Portugal, delta already amounts to .
The European Centre for Disease Control that, by the end of August, the variant will be responsible for 90 per cent of cases in the European Union. It wants an acceleration of EU vaccination programmes, noting two doses 鈥減rovides nearly equivalent protection against the delta variant [compared with older variants]鈥�.
Other parts of the world are also struggling with the ease with which delta spreads. , Australia, and surrounding districts following more than a hundred cases of the variant. just 10 days after lifting it, following imported cases of delta. In the US, the number of cases of the variant has increased from about to .
Researchers in South Africa . Even Singapore, a country that fared well in controlling earlier stages of the pandemic, has seen the variant become dominant, , in the double digits.
鈥淯nless something else comes along, delta is probably going to outcompete all the other viruses around, maybe with the exception of the beta variant,鈥� says at the University of Cambridge. 鈥淏ut delta looks to be more transmissible, so it will probably spread faster [than beta].鈥� Health authorities in the UK delta is about 60 per cent more transmissible than alpha.
A by Gupta and colleagues found delta not only spreads more easily than previous variants, but is better at evading the protection provided by current vaccines. The research, not yet peer-reviewed, was based on more than 100 healthcare workers in India inoculated with the Oxford/AstraZeneca vaccine. While the vaccine鈥檚 efficacy was reduced, Gupta says the findings show that it is still protective against severe disease.
Eric Topol at the Scripps Research Translational Institute in California says it is just a matter of time until the variant makes significant inroads across South America. 鈥淚 don鈥檛 think there鈥檚 any question that delta will be globally dominant as it has shown exponential growth on multiple continents now, including Europe, North America, Africa and Asia,鈥� he says.
The international spread and toll the variant takes will largely depend on vaccination status and how many people have immunity from previous infections, adds Topol. 鈥淧laces with high vaccination rates like the UK and Israel are unlikely to see a significant rise in deaths, and the hospitalisation rates are clearly flatter when the older, higher-risk people are predominantly vaccinated,鈥� he says.
The big danger from delta鈥檚 global spread is for countries where relatively few people are vaccinated, says Gupta. 鈥淚t鈥檚 going to lead to a great disruption and a large number of deaths in places where there isn鈥檛 much vaccine,鈥� he says. Gupta is also concerned about high levels of delta leading to new mutations of the variant.
