Since the outbreak of COVID-19, there have been a series of mutations in COVID-19, and the COVID-19 epidemic in many places is mainly caused by these mutant strains. The virus load of Omicron BA2.2 mutant is very high and highly contagious, which leads to the further spread of Omicron BA2.2 mutant in many cities. However, the patients with Omicron BA2.2 mutant are basically asymptomatic infection, and there are very few severe patients.

Omicron BA2.2 mutant was found in Guang 'an, Sichuan.

After the outbreak of COVID-19 in Guang 'an, Sichuan, there were less than 10 newly diagnosed patients in Guang 'an, Sichuan, and dozens of asymptomatic infections occurred every day. There are so many asymptomatic infected people, mainly because the COVID-19 epidemic in Sichuan is dominated by Omicron BA2.2 mutant, and the infection chain of COVID-19 epidemic caused by Omicron BA2.2 mutant has become very complicated.

The incubation period of Omicron BA2.2 mutant is 7~ 15 days.

In most cases, the incubation period of Omicron BA2.2 mutant in patients is 7~ 15 days. When a patient is tested for nucleic acid, even if the patient has been infected with the Omicron BA2.2 mutant, the result of the nucleic acid test of the patient may still be negative. The Omicron BA2.2 mutant has a certain incubation period, so it is relatively difficult to control the Omicron BA2.2 mutant.

We need to wait for a vaccine specifically targeting the Omicron BA2.2 mutant.

Prior to this, although many people had been injected with three doses of COVID-19 vaccine, the traditional COVID-19 vaccine had relatively little effect on Omicron BA2.2 mutant and other mutants. Omicron's COVID-19 vaccine has entered the clinical testing stage. If all goes well, we will soon have the opportunity to transfer the COVID-19 vaccine to Omicron.