COVID-19 has developed five times since its birth. The first time was in Britain, from ordinary virus to alpha virus; The second evolution of South Africa, the emergence of beta virus; The third time was in Brazil, and the gamma virus was officially born; The fourth time in India, the most deadly Delta virus appeared; The fifth time was in South Africa, and the most contagious, real King Omicron virus was born.
At present, the most widely spread virus in the world is Omicron virus. Although the toxicity of Omicron virus is not very strong, it is not even comparable to previous viruses. But the biggest advantage of Omicron lies in its communication. Omicron is not only extremely secretive, but also has a very long incubation period. Coupled with its asymptomatic infection, it is very difficult to detect Omicrovirus.
Maybe you were negative when you took the COVID-19 test yesterday, but you will become positive if you take the test again today. Omicron won the title of "Poison King" because of its strong concealment and infectivity. Compared with Delta and its previous variants, Omicron is more likely to cause reinfection. In addition, repeated infection still has a certain risk of serious illness, which will be transmitted to high-risk groups such as the elderly at home and those with basic diseases.