Eastern Time on December 30, 2022
The U.S. Centers for Disease Control and Prevention released data showing
it was estimated that 40.5% of the cases of new coronavirus
infection in the United States that week were the highly contagious
Omicron subtype strain XBB.1.5html
strain, 's immune evasion ability has been enhanced, and its prevalence in some foreign areas has led to an increase in the number of infections. However, foreign data show that its pathogenicity is no different from previous strains. ”
At the State Council Joint Prevention and Control Mechanism press conference on December 20, Xu Wenbo, director of the Institute of Viral Diseases of the Chinese Center for Disease Control and Prevention, introduced that my country has detected BF.7, BQ.1, and XBB transmission in the past three months. A total of more than 130 subclades of Omicron were imported into my country, and 50 subclades caused associated local cases or outbreaks, including BQ.1 and XBB. Among them, BQ.1 and its subclades were detected in 49 cases in 9 provinces, and XBB subclades were detected in 11 cases in 3 provinces.
Xu Wenbo said that BQ.1 and XBB have not yet formed a dominant spread in my country. Currently, BA.5.2 and BF.7 are still the main ones, but their spread advantages will gradually increase. , BA.5.2 and BF.7, as well as more than 50 other input sub-branches, may form a common cycle.
Experts: Whether XBB will cause secondary infection
depends on two aspects
According to CCTV news, experts say that XBB may spread faster. XBB, BQ.1, and BQ.1.1 are similar in pathogenicity to previous strains, but their immune evasion ability has increased. Therefore, the spread of viruses caused by may be faster than before.
If you encounter these strains, the probability of reinfection mainly depends on two aspects:
On the one hand, it is how much overlap the strain encountered again has with BA.5 and BF.7. If the virus keeps mutating and the cross-protection effect is reduced, infection may occur;
On the other hand, it depends on the level of autoantibodies .
In response to the problem of reinfection, Lu Hongzhou, president of Shenzhen Third Hospital, said that statistics from Israel show that in the past year, the reinfection rate of the new coronavirus in Israel has increased with the popularity of new strains. In recent weeks, under the epidemic of BQ.1.1 and XBB mutant strains, the new crown reinfection rate has increased from 20% to 35%, and is still growing; during the epidemic period of BA.1 and BA.5 mutant strains, the peak reinfection rates were 15% and 20% respectively.
This means that herd immunity is less effective in preventing infection with new mutant strains of BQ.1 and XBB that can escape the immune barrier established by previous vaccinations and natural infections. "Although you will not be infected with COVID-19 within a short period of time, such as three to four months, it is undeniable that the prevalence of new strains may shorten the 'safe window' for secondary infection. Therefore, in European and American countries, some people with poor immunity may be infected multiple times within a year."
What response strategies should we adopt? Lu Hongzhou said that vaccination is still an important means. Although the immune barrier established by vaccination cannot effectively prevent reinfection with new strains, it still has a good protective effect in preventing severe illness and death.
norfloxacin is popular, banned for minors!
The spread of the XBB.1.5 strain in the United States has attracted much attention. Recently, a post said, "To deal with XBB, everyone should stock up on montmorillonite powder, Zhengchangsheng, and norfloxacin." Many related drugs were out of stock. "Minors are prohibited from taking norfloxacin" was a hot search topic.
Norfloxacin is a broad-spectrum antibiotic. After people take it, it can hinder the action of DNA gyrase of pathogenic bacteria in the human digestive tract, hinder the replication of bacterial DNA, thereby inhibiting the bacteria. It is often used for diarrhea caused by bacteria, such as enteritis and dysentery-like diseases. It is ineffective against diarrhea caused by viruses.Because acute diarrhea is often caused by viral infection, when symptoms of diarrhea occur, you must find out the cause and then take the corresponding medicine. Do not take this medicine indiscriminately. It should be noted that norfloxacin can hinder the growth and development of bones, so minors under the age of 18 are prohibited from taking norfloxacin. Can the
XBB strain cause diarrhea? Liao Shanying, deputy chief physician of the Department of Gastroenterology, Guangdong Provincial People's Hospital , said that the symptoms of COVID-19 infection are mainly respiratory symptoms, and some patients will also have gastrointestinal symptoms. However, the incidence rates vary according to different clinical observation reports. About 10% of patients may have gastrointestinal symptoms. If diarrhea occurs due to COVID-19 infection, there are many reasons. The new coronavirus itself will infect the gastrointestinal mucosa, causing viral enteritis , resulting in diarrhea.
Li Tong, chief physician of the Department of Infectious Diseases at Beijing You'an Hospital, once said that some people infected with the new coronavirus do have symptoms of vomiting and diarrhea, which usually resolve on their own in 1 to 3 days. It has not been found that XBB1.5 is more likely to invade the cardiovascular and cerebrovascular systems and the digestive system. Drugs for treating respiratory tract infections and digestive tract infections can be prepared appropriately, but there is no need to hoard them in large quantities.
Comprehensive: People's Daily, CCTV, Guangdong Health Online, Nanfang Daily, Guangzhou Daily
Source: Guangzhou Anti-evil
