202 1 can I travel during the summer vacation? What is Delta Strain?

There must still be a lot of people who want to travel during the summer vacation. After all, every summer vacation is a tourist season, so the question is, is this summer vacation suitable for traveling? How much do you know about the spread of Delta virus?

Can I still travel in summer? First of all, people in areas with high and medium epidemic risk should cancel their travel.

Second, people in other areas should carefully check the epidemic risk of travel destinations before traveling, and should suspend travel to high and medium risk areas.

Third, no matter where you travel, you should take personal precautions, including wearing masks and washing your hands frequently, and try to avoid and reduce going to crowded places indoors. When you are outdoors, you should also pay attention to maintaining an appropriate interpersonal distance.

Fourth, the elderly and patients with chronic diseases, especially those who have not completed the whole vaccination in COVID-19 or COVID-19, but have not reached 14 days, should try not to travel abroad.

What are the characteristics of this epidemic in Nanjing?

First, the epidemic was triggered by the introduction of Delta mutant. Delta mutant has high viral load, strong transmission ability, fast transmission speed and long negative time.

Second, the time is special. During the summer vacation, tourists from the resort get together.

Third, the place where it happened is the international airport, which is densely populated and has a large circulation.

Because of these three characteristics, the epidemic has spread to other cities in the province or outside the province, and there is still the risk of continuing to spread to other areas in the short term.

How did the Zhangjiajie epidemic spread this time?

1, the first case in Zhangjiajie was also related to the epidemic situation at Nanjing Lukou Airport. Cases or infected people who spread to Zhangjiajie, Hunan Province infected others through tourist attractions, large-scale performances and other means, leading to further spread. It is a key epidemic spot with a large number of people infected and spread except Nanjing in the near future.

2. Because the spread occurs in densely populated areas with a large floating population, the risk of epidemic spread is still relatively large and difficult to control.

3. At present, in addition to the powerful comprehensive measures for epidemic control in Nanjing and Zhangjiajie, a series of control measures such as large-scale investigation and tracking of floating population in the two places have also been urgently launched throughout the country.

What are the characteristics of critically ill patients in this epidemic?

Since the outbreak of the epidemic in Nanjing, as of 8: 00 am on March1day, there have been 9 critically ill patients.

First of all, all these patients were infected with Delta mutant strain.

Second, in the early stage of the disease, the symptoms of these patients are not typical, but some have symptoms such as fever, fatigue and cough.

Third, the disease progresses very quickly, and it will turn to the severe stage in an average of five days.

Fourth, most of these critically ill patients have basic diseases.

What are the characteristics of Delta strain?

First, communication skills have been significantly enhanced. According to the research of the World Health Organization, compared with other non-VOC and old virus strains, the spread rate of Delta virus has increased by nearly 100%, that is, it has doubled. The recent outbreak of Delta mutant virus in Guangdong caused an epidemic in COVID-19, and the study of transmission dynamics also suggested that its infectivity was higher than that of the previous epidemic virus 1 times. At the same time, a very important index reflecting its transmission ability is the transmission speed, mainly because its incubation period and passage interval are shortened, with an average of about 1-2 days. We used to know that the incubation period was about 5-6 days, but now it is about 4 days or more. Its passage interval used to be 4 or 5 days, but now it has become about 3 days.

Second, it may lead to an increase in the severity of the disease. This is a situation that can obviously aggravate the disease that our country has not seen in the research and observation of the epidemic situation in Guangdong. However, in the British study, it was found that patients with Delta virus had increased disease severity. Compared with α mutant, the risk of hospitalization of patients infected with δ mutant increased by 2.6 times. At present, there is no clear research result on its impact on mortality.

Third, the existing research and observation also suggest that the protective effect of COVID-19 vaccine on Delta virus may decline, but the current vaccine still has a good preventive and protective effect on Delta virus.

Is there any change in the mode of transmission of δ strain?

Its mode of transmission has not changed, and it still spreads through the following main channels:

The first is the spread of respiratory droplets, that is, sneezing, coughing or even talking with respiratory droplets carrying viruses will infect people who are in close contact with him. This is the most important way.

The second is the spread of contact pollutants. Respiratory droplets and secretions pollute the surface of objects, and the virus can survive for a period of time. Others will get infected by touching the surface of contaminated objects with their hands. When they touch their mouths, eyes and noses, they will be infected.

The third type can also form air transmission, or aerosol transmission, especially in narrow indoor spaces with poor ventilation. If an infected person coughs or sneezes, it will form very fine particles of respiratory secretions, which can be suspended in the air and inhaled by others, leading to infection, and even people who discharge the virus will leave this space. There will still be viruses in the air for a certain period of time, and others will cause infection after entering.

How effective is COVID-19 vaccine against the mutant strain?

1, clinical data show that no vaccine can 100% prevent infection, but in general, all kinds of mutant strains are still within the controllable range of current vaccines. The prevention and control measures taken by our country since last year are also effective.

2. Based on the real-world research carried out in overseas countries with severe epidemics, especially in Chile 1000 million people, the overall protection rate of our national Kexing company's vaccine for all symptoms and mild diseases is over 65%, and the prevention rates for severe diseases, ICU admission and death are 87.5%, 90.3% and 86.3% respectively, which fully shows that our vaccine can

3. The existing research also shows that the protective power of vaccines from various technical routes in the world to COVID-19 mutant has indeed declined to some extent, but this mutant is still within the scope of vaccine protection. In particular, its neutralizing antibody and protection rate still exist to some extent.

Is it necessary to strengthen vaccination of COVID-19 vaccine?

Preliminary observation shows that it is not necessary to carry out intensive vaccination for the general population who have completed immunization within one year. However, for the elderly and patients with basic diseases who have completed immunization for more than 6- 12 months, and those who need to work in high-risk areas due to work needs, whether and when to carry out booster injection is under study.

What is the vaccination status of people over 60 years old and adolescents aged 12 ~ 17?

Vaccination for the elderly over 60 years old has all been included in the scope of vaccination. As of July 28th, 65438+500 million people over 60 years old have been vaccinated. 12- 17-year-old minors were vaccinated in a safe and orderly manner by region and age. As of July 28th,12.48 million people have been vaccinated.