It was first discovered in England in June 5438+February 2020. Evolutionary sequence B. 1. 1.7, the main feature of variation is to strengthen transmissibility and toxicity. The incidence and mortality of severe cases are high.

2.β(β strain)

It was found in South Africa from June 20438 to February 2020 that there was another spike protein mutation in this mutant virus strain. The evolutionary sequence B. 1.35 1 is characterized by increased transmission and toxicity. The protective efficacy of mRNA vaccine on the market is relatively lower than that of mutant virus.

3. Gamma (gamma strain)

In February 2020, 42% of 3 1 sample sequenced in Amazon, Brazil, were infected with this mutant. There are several mutations in the evolutionary sequences P. 1 and γ, including three mutations in the binding domain of spike protein receptor, which increases the transmission rate and affects immunity.

4. Delta

It was first discovered in India in May, 20021year. Before August 4th, 20021year, it was probably the most transmissible COVID-19 mutant. Evolutionary sequence B. 1.6 17.2, with no obvious increase in pathogenicity, low fever symptoms, showing common sense olfactory loss.

5. Omicron

As of 202 1,1,27, a new variety "Omicron" from COVID-19 has been discovered in many countries and regions. The evolutionary sequence B. 1. 1.529 mostly infects the upper respiratory tract, with a high proportion of asymptomatic symptoms and a rapid recovery of infected people.

Extended data:

Novel coronavirus (20 19, coronavirus pneumonia-19), referred to as "COVID-19", was named "20 19 coronavirus disease" by the World Health Organization, which refers to the pneumonia caused by novel coronavirus infection in 20 19. On February/KOOC-0//KOOC-0/day, 2020, the Director-General of the World Health Organization, Ted breyer Ghebreyesus, announced in Geneva that novel coronavirus would be named "Coronavirus Pneumonia-/KOOC-0/9".