What are the characteristics of the Delta variant?

First, the transmissibility is stronger.

Feng Zijian, a researcher at the Chinese Center for Disease Control and Prevention, said that judging from the cases of the current round of epidemic in Guangzhou, the infectivity and transmissibility of the "Delta" variant virus have been significantly enhanced, especially the incubation period or passage interval has been shortened, and it has been transmitted for five or six generations in just 10 days, and the transmission speed of the virus is accelerating.

PCR tests of infected samples showed a significant increase in viral load. The transmissibility of this variant has doubled compared to previous strains and increased the transmissibility of the strain found in the UK by more than 40%.

Second, the viral load is high.

A team of researchers from the United Kingdom found that people infected with the Delta variant had a 1x higher risk of hospitalization than those infected with the Alpha variant, which was first identified in the United Kingdom.

In the current epidemic in Guangzhou, the proportion of patients who became severe or critical after the onset of illness was higher than before, and the time for turning severe and critical was earlier. The lower the CT value, the higher the viral load in the body, and the longer the time it takes for the patient's nucleic acid to turn negative.

3. There may be immune escape, but the vaccine still has a protective effect.

In this regard, Feng Zijian explained, "Judging from the epidemic in Guangdong, the proportion of people who have not been vaccinated among the confirmed cases who have become severe or have severe disease is significantly higher than that of vaccinated people, and the vaccine still has a protective effect against the new strain." ”

In addition, studies have shown that among the 3 cases confirmed to be infected with the "Delta" strain after returning from Sichuan, 2 have been vaccinated and 1 has not been vaccinated. Compared with unvaccinated cases, vaccinated cases had a shorter time from diagnosis to developing positive antibodies, higher CT values, and shorter hospital stays, the study said.

There may be immune escape from the Delta variant:

According to India**, at present, cases of infection with the new coronavirus variant "Delta +" have been found in 3 states of India, and the first case of infection is a 65-year-old woman in **state, she was previously infected with the new crown and has **, in addition, she has also received two doses of vaccine. Meanwhile, 21 Delta+ cases have been reported in Maharashtra and Delta+ cases have also been detected in Kerala.

From "Alpha" to "Delta" and then to "Delta +", the new crown mutant strain has changed again and again. At this moment, it is necessary to speed up the research on the Delta strain and adopt targeted epidemic prevention strategies. Experts pointed out that Delta presents three characteristics, one is that the transmissibility is twice as high as that of previous strains, the second is the high viral load, and the third is that there may be immune escape, but China's vaccine is still effective against the Delta variant.

The above content refers to Take a look at the news The delta variant may have immune evasion and China's vaccine is still effective.

Encyclopedia Delta.

It is more virulent and more contagious.

According to studies in the United Kingdom, the infectivity of the Delta variant is at least 60% higher than the alpha variant previously found in the United Kingdom, and 140% more contagious than the most primitive strain of the new coronavirus.

The symptoms caused by the Delta virus are also very confusing, according to the UK**, the symptoms of this variant are headaches, runny nose and sore throat, which are very similar to the symptoms of the common cold.

It's not that scary and probably not very contagious.

Based on the current research, the Delta strain exhibits the following very distinct characteristics:

First, the ability to spread has been significantly enhanced. According to the World Health Organization, Delta virus has an almost 100% increase in transmissibility compared to other non-VOC and old strains of the virus.

The outbreak of the Delta variant in Guangdong Province has shown that it is twice as contagious as the previous circulating strain. At the same time, the incubation period and passage interval have been shortened, the incubation period is now about 4 days, and the passage interval is now about 3 days.

Second, it may lead to an increase in the severity of the disease. After being infected with the "Delta" strain, the viral load in the patient's body is relatively high. Having underlying medical conditions, such as respiratory diseases such as asthma and bronchiectasis, or diabetes and hypertension, are risk factors for severe disease.

Third, the current existing research and observation suggest that the protection of the new crown vaccine against the Delta virus may be reduced, but the current vaccine still has a good preventive and protective effect against the Delta virus. Compared with unvaccinated cases, vaccinated cases have a shorter time from diagnosis to the development of positive antibodies, a higher CT value, and a shorter length of hospital stay.

The Delta strain has spread, and the number of new confirmed cases in Australia has exceeded 1,000 for the first time

On August 26, 2021 local time, Australia reported that the number of new confirmed cases of the new crown exceeded 1,000 for the first time. Among them, New South Wales, where Sydney is located, announced that in the past 24 hours, there were 1,029 new local infections, a record high.

According to Singapore's Lianhe Zaobao, Sydney is Australia's largest city and the epicenter of the current outbreak. The region is facing difficulties in containing the spread of the Delta strain, and the outbreak continues to spread even after two months of lockdown. Sydney's Westmead and Blacktown hospitals urgently set up outdoor tents to cope with the growing number of patients.

NSW Premier Berejiklian said authorities had quadrupled the number of intensive care ventilators in the state to 2,000 in early 2020. She said that although the health system is "under pressure", it can withstand the current crisis once vaccination rates rise.

In addition to Sydney, Australia's second-largest city, Melbourne, and the capital, Canberra, are also under strict lockdown. More than half of the country's 25 million people are under strict stay-at-home orders, Reuters reported.

The above content refers to The Paper - What are the new characteristics of the "Delta" variant? How to prevent it? Hainan CDC tells you.

The transmissibility of the Delta virus has been significantly enhanced. According to the World Health Organization, Delta virus has nearly doubled the transmissibility rate and 1 times more transmissibility than previous circulating strains compared to other non-VOC and old virus strains. At the same time, its incubation period and passage interval have been shortened, about 1-2 days on average.

In the past, the incubation period was about 5-6 days, but now it is about 4 days. Its passage interval used to be days, but now it has become about 3 days. Now the epidemic is frequent, so personal protection must be done!

Summary. Hello, regarding the naming of the delta variant, the delta variant was named by the WHO in May 2021, when it first discovered the new coronavirus variant in India. This strain is not only highly contagious, but also more likely to develop severe disease in infected people.

The Delta variant, the first to be detected in India, has spread to 92 countries. According to the World Health Organization, the delta variant has significantly increased its transmissibility and is becoming the main variant of the new coronavirus that is causing the current global epidemic. Hope it helps.

What is the name of the variant site of the Delta strain?

Hello, regarding the naming of the delta variant, the delta variant was named by the WHO in May 2021, when it first discovered the new coronavirus variant in India. This strain is not only highly contagious, but also more likely to develop severe disease in infected people. The Delta variant, the first to be detected in India, has spread to 92 countries.

Hello, what do you choose?

The second.

More than two mutations of the "double mutant virus" new coronavirus variant strain was first detected in India in October 2020, and was later transmitted by ** as a "double mutant virus". The term "double mutant virus" is inaccurate, as this variant contains a total of 15 mutations, of which the L452R and E484Q mutations occur at the junction of the spike protein and ACE2 (angiotensin-converting enzyme 2) receptors, respectively, improving the virus's ability to invade cells and escape immunity, respectively. As a result, the Delta strain is now becoming the main circulating virus variant in the world, and has spread to more than 92 countries and regions around the world (data released by the WHO on June 21).

In May 2021, the WHO named it after the Greek letter δ (delta), which is now known as the Delta strain. The Delta variant has evolved from this. Characteristics of the Delta variantThe Delta variant has three characteristics:

High viral load, greater transmissibility, and immune evasion. Viral PCR tests from infected people show a significant increase in viral load (in colloquial terms, the amount of virus per milliliter of blood is measured to show the amount of virus in each milliliter of blood).

Delta. delta) mutant strain.

The Delta variant was first identified in India in October 2020. So far, it has become the mainstream of new cases in more and more countries, and more than 100 countries and regions have reported cases of infection with the "Delta" strain.

The epidemic in Guangdong and Ruili in Yunnan appeared in China before.

The epidemic, and the current Nanjing epidemic, have been confirmed to be caused by the "Delta" strain with different mutation sites, and the gene has been sequenced.

The results showed that it had a high degree of homology, and strong transmissibility became the most significant feature of the "Delta" strain.

This strain was first identified in India in October 2020 and was initially called a "double mutant" virus。According to the Ministry of Health of India at the end of March this year, the "Indian Coronavirus Genomics Consortium", a group of 10 laboratories, found in samples collected in Maharashtra that the new variant carries E484Q and L452R mutations, which may lead to immune evasion and increased infectivity. The variant was named by the WHO and was named with the Greek letter δ (Delta) on 31 May.

Shahid Jamil, dean of the School of Biological Sciences at Ashoka University in India and a virologist, said in an exclusive interview with India's "Shillong Times" that this mutant strain is called "double mutation" is not accurate enough, containing a total of 15 mutations, 6 of which occur on the spike protein, and 3 of which are more critical

L452R and E484Q mutations occur in the region where the spike protein binds to the "angiotensin-converting enzyme 2 (ACE2)" receptor in human cells, L452R improves the ability of the virus to invade cells, and E484Q helps to enhance the immune escape of the virus. The third mutation, p681r, also allows the virus to enter cells more efficiently.

Whether the pathogenicity of the Delta strain is enhanced remains to be studied:

Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, recently said that the Delta strain has a higher chance of severe disease than the alpha strain, which is currently the most common strain in the United States.

A Scottish study also suggested that the Delta strain has the potential to increase the risk of hospital admissions. However, the WHO believes that there is no indication that the Delta strain will cause an increase in the fatality rate of the new coronavirus.

It's the mutant strain in India, even the vaccine and the high temperature can't kill him, it's so terrible, we finally controlled the epidemic, and we were destroyed by this mutant strain.