(Fighting against New Coronary Pneumonia) Why does overseas import recover? Are holidays restricted? Wu Zunyou 5 answers new questions about the new crown
China News Service, Beijing, December 21st, title: Why is overseas import re-yang?
Are holidays restricted?
Wu Zunyou 5 answers new questions about the new crown
China News Agency reporter Gao Kai
At a press conference held on the 21st of the Joint Prevention and Control Mechanism of the State Council of China, Wu Zunyou, chief epidemiology expert of the China Centers for Disease Control and Prevention, gave five answers in a row, giving expert explanations on new questions about the new crown pneumonia epidemic that have recently emerged.
Why did imported confirmed cases recover after isolation?
Recently, some imported confirmed cases recovered after isolation, and some immigrants were diagnosed with new coronary pneumonia cases after a few days of nucleic acid-negative isolation. For the reasons, Wu Zunyou said that these phenomena are not unique to imported cases.
He pointed out that since the outbreak, some special cases have been reported in various places.
There are two reasons for these phenomena: on the one hand, each person has different clinical manifestations after being infected with the new coronavirus, so there are sometimes yin and sometimes yang phenomena; on the other hand, it also depends on the sampling quality, the sampling location is correct, The sampling operation is standard, and the possibility of collecting positive samples will be great.
What is the risk of virus infection in cold chain food?
Cold chain food, especially the new coronavirus detected in some imported frozen food, what is the risk?
Wu Zunyou said that since the second half of the year, several clusters or sporadic cases have occurred due to cold chains or imported goods.
At present, China has strengthened its management.
These measures play a very important role in reducing and preventing personnel infections caused by cold chains as carriers.
He specifically stated that on the same day, in fact, for the majority of consumers, the risk of infection caused by the purchase of food imported cold chains is very low.
Wu Zunyou said, first of all, a positive nucleic acid does not necessarily mean infectiousness.
Secondly, in the test, the value that determines the negative and positive nucleic acid test is called the CT value. The larger the CT value, the smaller the pollution and the lower the probability of containing live viruses.
He pointed out that among all imported cold-chain foods and goods across the country, most of the detected ones have higher CT values.
“In order for pollution to cause infection, the amount of pollution must be relatively large, and long-term repeated contact is necessary. So as long as we maintain hand hygiene and keep raw and cooked separately, the risk of infection will be very small.” Wu Zunyou said.
Will the protective measures be adjusted after the new crown vaccine?
After receiving the new crown vaccination, what changes will people's protective measures have, and do they need to wear masks?
Wu Zunyou emphasized that "you can't bet all the treasures on the vaccine."
He pointed out that personal protective measures such as wearing masks, maintaining social distance, and washing hands frequently are still the simplest, most acceptable and most effective protective measures for individuals to prevent infection.
Wu Zunyou said that for individuals, it takes a certain amount of time to generate protective antibodies for vaccination. For groups, it also takes time for a sufficient proportion of people to be vaccinated.
"So to prevent the new crown pneumonia epidemic from rebounding this winter and next spring, we can't bet everything on the vaccine."
"The prevention and control measures at this stage must still be adhered to. The application of vaccines, especially to give high-risk populations priority in vaccinations, provides new technical means to control the rebound of the epidemic this winter and next spring, and also makes us more confident, More calmly respond to the epidemic that may occur this winter and next spring." Wu Zunyou said.
Will the movement of people during holidays bring new risks to the epidemic?
As the New Year's Day and Spring Festival holidays approach, the movement of people is becoming more frequent. Will this movement bring some risks to the epidemic?
In this regard, Wu Zunyou suggested reducing the flow.
He suggested that people reduce unnecessary trips during the New Year's Day and Spring Festival, and return home during the Spring Festival travel season.
For some special groups of people, such as the elderly, people with chronic diseases, and pregnant women, Wu Zunyou does not recommend making travel arrangements.
Wu Zunyou said that people should minimize unnecessary gathering activities during the festival.
Enterprises and institutions must control the number of gathering activities. Those with more than 50 people should have a complete prevention and control plan and prevent and control measures. For the gathering of individual families, it is best to control the number of people below 10.
Ask the source of the virus
Recently, foreign media reported that some countries have made new discoveries about the source of the new crown virus. Some countries have detected the new crown after testing throat swab samples collected from local cases in November and December last year. The RNA sequence of the virus has once again aroused people's attention to the traceability of the new coronavirus.
Wu Zunyou said on the same day that determining the source of the virus is a complex task. Tracing the source of the new coronavirus requires global efforts. To develop strong international cooperation, multidisciplinary cooperation is required.
Experts from the World Health Organization have stated that there may be more than one case of the new coronavirus, or more than one first case.
More and more data show that the initial distribution of the new coronavirus may be in multiple places around the world.
"We have also noticed that the media and some scientific journals have published some recent developments in foreign research, and there are many new advances in tracing the source. Virus tracing is a scientific issue. Chinese scientists have also conducted research from many aspects, including from the population, At the environmental, genetic and molecular level, as well as from animal aspects, we have carried out traceability research work, and actively participate in the traceability work of the international community. We hope that our research can provide more useful data for global traceability." Wu Zunyou said.
(Finish)