The Fact About Delta Variant


The Delta variant was first identified in India in December 2020 and led to major outbreaks in the country. It then spread rapidly and is now reported in 104 countries, according to a CDC tracker. It currently the most prevalent new coronavirus mutants in the world. It is characterized by strong transmission, short incubation period, high viral load, long detoxification time, rapid development of the disease, and a high proportion of severe illnesses.

You can easily know by looking the picture as below.In the U.K., for instance, the Delta variant now makes up more than 97% of new COVID-19 cases, according to Public Health England.


Vaccination is the Best Protection Against Delta

There are many COVID-19 vaccines on the market now, most of them are inactivated vaccine.Currently there are six COVID-19 vaccines produced by Chinese companies, and it have been approved to be adopted on a wide scale in China. Now the total vaccinated people in china against COVID-19 exceeded 1 billion, covering 76% of the population.

Studies on previous outbreaks in Guangzhou city, China showed that the overall protection rate of Chinese inactivated vaccines against the Delta strain was close to 60%, and the protection rate of severe cases was 100%. According to the latest data, the antibody level increased by more than 10 times when the second dose of domestically-made inactivated vaccine was vaccinated 6 months later.


The study reinforces that it takes two doses of the inactivated vaccines to protect effectively. Individuals who completed the first dose should receive their second dose as soon as possible, in accordance with technical vaccination recommendations for COVID-19 vaccines in China. Not just Chinese vaccines, but also for the widely used Pfizer and AstraZeneca vaccines. The picture as below shows that around 2.1 billion people have fully vaccinated worldwide.


Data from our world in Data

*The above chart shows the total number of COVID-19 vaccination doses administered. Note that this is counted as a single dose, and may not equal the total number of people vaccinated.

A recent study shows that two doses of these two vaccine are more effective than just one dose. The study was published on July 21 by the well-known medical journal " The New England Journal of Medicine". The research was carried out in the United Kingdom from April 5 to May 16, 2021. When the main strain of virus circulating in the United Kingdom was shifting from Alpha to Delta. Researchers focused on Pfizer and AstraZeneca vaccines, and compared the vaccine's effectiveness against these two types of mutant strains.

The results of the study show that with only one dose of vaccine (Pfizer or AstraZeneca), the effective rate is only 30.7% for Delta mutant strains. But after all two doses of vaccines were vaccinated, the effective were significantly improved. For the delta variant strain, the effective rate of two doses of Pfizer vaccination was 88%. While AstraZeneca vaccine has an effective rate of 67.% for the two-dose vaccination against the Delta mutant strain.

What Should We do to against Delta Variant?

Fully Vaccinated the Vaccines

The truth is that all vaccines are effective to prevent severe illness and produce antibodies to against coronavirus. So to inoculate any of them now is the best way to protect yourself, and it is better to inoculate 2 doses.

It’s Better to Wear Mask in the Public

Some experts are recommending to wear masks, even if you're fully Vaccinated. Because vaccinations cannot prevent 100% infection. So we can do such as wearing masks, washing hands frequently, and gathering less. This is not only to protect yourself, but also to protect others.

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