Repeated infection in COVID-19 refers to the situation that a person is infected with COVID-19 virus and is infected again or more times after recovery.
Usually, after the first infection with COVID-19 (or after vaccination), our body will enhance the immunity of T cells, and memory B cells secreting antibodies will enhance their response to spike proteins and neutralize the effectiveness of antibodies.
So will the same person be infected by Omicron twice?
The answer is yes.
Previous studies have shown that the antibody level of patients with COVID-19 will drop rapidly after rehabilitation. China's research team reported in the British journal Nature Medicine in June that their investigation in Chongqing found that the total antibody level of about 90% cases would drop by more than 70% two months after discharge. Based on this, the researchers believe that COVID-19 infected people may be reinfected after recovery. The newly reported cases of recurrent infection confirm the above conclusion, indicating that COVID-19 infected people may not be immune for life.
Academician Zhong Nanshan said recently that according to foreign data, once infected with Omicron, 78% people will not be infected again for a long time, regardless of symptoms.
Japan
In Japan, where the data is still released normally, on June 5438+February 1 1 day, there were1/9000 new infections,19000 deaths and 386 severe cases.
Since it was discovered in 20021,1 1 year1October, Omicron mutant has gradually replaced other mutants around the world and become the dominant strain causing the global COVID-19 epidemic. At present, after the gradual liberalization in China, the number of infected people in various places has increased greatly. The main strains were BA.5.2 and BF.7, which caused many infections.
It is reported that the accelerated mutation of Omicron may shorten the time window of secondary infection and increase the possibility of multiple infections. In fact, since 2022, hundreds of species have actually been found in Omicron, but repeated infections are rare.
How long does it take to repeat the infection?
In fact, Taiwan Province Province had similar "invincible immunity" propaganda before. Simply put, if you have been vaccinated with two or three doses of vaccine and then infected with COVID-19, you will automatically acquire invincible immunity, and you will not be infected again for a long time, just like eating invincible stars.
And the result?
According to the statistics of the epidemic command center, the number of reinfected people in Taiwan Province exceeded 30,000 within three months, of which 2% were re-diagnosed within 1 month.
Doctors also warned that there is "no limit" to the number of times a person can be infected with COVID-19 virus.
Therefore, when the media publicizes, don't take it out of context, it is easy to mislead the public.
Antibodies obtained by natural infection with Omicron will decrease over time. According to the data of the Ministry of Health, the earlier you are infected with the virus, the higher the risk of repeated infection.
As can be seen from the above figure, the infection risk of people who have been infected with the original strain or δ strain before is basically the same as that of people who have never been infected, that is to say, there is no antibody.
However, if the Omicron strain is infected this year, the risk of repeated infection within 1-3 months is very small.
For our reference, don't worry too much about repeated infections within 1-3 months after Yang.
In a paper recently published by Cao Yunlong, a domestic expert, the plasma of patients who broke through the infection of BA.5 after vaccination had a higher neutralizing titer to BA.5 and BF.7 after one month of rehabilitation (that is, the anti-infection effect was better), but it had a higher neutralizing titer to Bq.1.10 (Bq.10).
Therefore, it is hoped that relevant departments and media will pay more attention to the epidemic situation of new strains, publish the latest data, and promptly remind the public if there is an increase in new strains in China. It is convenient for people to further strengthen their self-defense and prevent the emergence of new strains after the year from causing a large number of repeated infections and causing new infection peaks.
For friends who are already positive, most people's symptoms will get lighter every time. The immunity obtained from the last infection can alleviate the symptoms of the next infection and reduce the hospitalization rate and mortality rate of the next infection [9].
However, for some elderly people or people with basic diseases, secondary infection in COVID-19 may aggravate symptoms and increase mortality.
For friends who have no yang, then
Try not
Try to be late.
The less the better.
At present, the proportion of asymptomatic and mild patients in China is above 90%. The virus is confined to the upper respiratory tract and will not invade the lungs and cause lung inflammation. Some serious, critical and even death cases are mostly caused by the aggravation or deterioration of the basic diseases caused by COVID-19. The currently popular strain of Omicron, like influenza, will gradually subside and recover after one week of infection.
What symptoms does COVID-19 have in 7 days?
(For reference only, the actual symptoms vary from person to person)
The pathogenesis of ordinary young people is suitable for the above situation. People who have been vaccinated with COVID-19 vaccine and completed intensive immunization have a shorter course of disease and a lighter condition. However, the thermodynamic process of some elderly people, especially those over 70 years old with basic diseases, is more complicated. Five days before and after the virus infection, if the elderly have obvious symptoms of holding their breath, they need to use lung CT images to diagnose whether there is lung infection.
If you miss someone who is positive in COVID-19, what are the chances of being infected?
It can be seen that wearing a mask is still necessary!
Finally, don't worry too much.
Many experts pointed out that Omicron was infected.
99% can fully recover within 7- 10 days.
Therefore, do a good job in personal protection and vaccination.
Note: asymptomatic infected people do not need to take medicine or abuse antibiotics. Just prepare the medicine properly. There is no need to snap up or hoard.
Plan the quarantine period in advance, don't panic ~