As early as February this year, a new study published in the Journal of Virology showed that more than 1000 different subtypes or branches have evolved since it was prevalent in novel coronavirus at the end of 20 19. Among them, four kinds of COVID-19, α, β, γ and δ, are the most harmful to human body and must arouse our vigilance.

Here is a brief introduction to these four viruses.

One: Alpha COVID-19 virus.

Alpha COVID-19 virus is a variant strain of B. 1. 1.7, which was first discovered in Britain and named by WHO with Greek letters. This virus is highly contagious, more deadly than the common COVID-19 virus, and it will spread faster. Therefore, the emergence of this virus will bring serious physical and life threats to local residents.

Two: Beta COVID-19 virus.

South Africa discovered β COVID-19 virus, which is a variant of COVID-19 virus, with strong lethality and fast spread. In a short time, the attack of this virus on human body is 3~5 times that of ordinary COVID-19 virus. If there is no good cure and specific medicine to resist, this virus will kill people in just a few days.

Three: Gamma COVID-19 virus.

The main characteristics of γ-COVID-19 virus are fast spread, strong lethality and high drug resistance. At present, there is no good drug to resist this kind of virus, usually through vaccine or conservative treatment. Because this virus appeared unexpectedly and spread very fast, it brought great danger to human life.

Fourth: Delta COVID-19 virus.

Delta is a mutant of MHM in COVID-19. It was first discovered in India in June 2020. In May, 20021,WHO named COVID-19 mutant B. 1.6 17.2, which was first discovered in India, as "Delta" mutant. This mutation was identified as one of the driving factors of the second wave of epidemic in India.

These four COVID-19 variant viruses have brought serious disasters to human beings and the country. We should also take active preventive measures in our daily life. Only in this way can we not be attacked by COVID-19 virus.

The appearance of COVID-19 virus has brought great disaster to our human society. Many countries lost their lives because of the abnormal COVID-19 virus. However, we also have scientific epidemic prevention methods and means to ensure that we can protect ourselves during the spread of COVID-19 virus. At this time, you should give scientific guidance in time instead of listening to rumors. Because listening to rumors is not good for you, and even makes your resistance decline.