Since May 7, 15 new local confirmed cases have been reported in shulan city, jilin province.On May 10, a new local confirmed case was reported in shenyang, liaoning province. The case took a high-speed train from jilin city to shenyang on May 5.Since May 9, six new cases have been confirmed in wuhan, hubei province, all from the same community.
What do you think of these new indigenous cases?How should the prevention and control of the epidemic be carried out on a regular basis?“News 1 + 1” bai yansong joins wu zunyou, chief epidemiologist of China center for disease control and prevention, for your interpretation.
Covid-19 is much more complex than SARS
Sporadic reports of cases were expected
Wu zunyou: this kind of situation is expected. When we first did news 1 + 1 on January 30, I told you that the tail would be quite long, and now it has been confirmed that the tail will be quite long.When we see sporadic case reports every day, especially from people who have tested positive, we know that sporadic cases will occur.
When there were zero cases in the SARS epidemic in 2003, there were no new reported cases. Many people kept the history or experience of the SARS epidemic in mind. When there were “zero” cases in covid-19, we also hoped that we could do the same.
Covid-19 is far more complex than SARS, and our understanding of it is still very limited. It is much more complex and difficult than SARS in terms of its transmission mode, prevention and control difficulties and clinical manifestations, which has further improved our understanding of it.
The first confirmed case of a laundryman in jilin shulan is not necessarily the source
Wu zunyou: after the outbreak of the epidemic, the epidemiological investigation is trying to find the source. It is really difficult to find the source.Yesterday, the Chinese center for disease control and prevention also sent professionals to shulan to assist in the investigation. As far as the current situation is concerned, it is still difficult to judge whether the patient diagnosed for the first time is the original patient or not.
The female comrade is a washerwoman, is a kind of speculation, she may be the source of the outbreak of a clustering, but also there is another possibility, is also a real source has not yet found, may be the main source for the spread of this, all of these need more epidemiological investigations, or biological methods are needed to analyze speculation.
Incubation period of another possibility, that is, some patients may be the incubation period is longer than the laundryman, he may infect the laundryman, and the laundryman incubation period is short, may be two or three days to disease, and the sources of real patients may after infection, seven or eight genius, the incubation period is contagious.If it’s like this, it’s very difficult to tell who passed it to whom.
Is the confirmed patient of jilin shulan related to the imported patient from Russia?
Zunyou wu: need to do right now, is to this group of viruses gathered in STD patients and from Russia’s entry into the virus gene sequence analysis of patients, their homologous, if very consistent homology, the presumption can is related with the Russian immigration cases, specific happened relationship, it is not good.
Jilin shulan confirmed laundry workers infected by clothes, is it possible?
Wu zun friends: a few days ago, there was a research report, the concentrations of the virus is about the air, the researchers of hospital patients and doctors to replace isolation ward air pollution areas, and clean the air sampling, found in medical staff to replace isolation clothing space, the air instead of higher levels of virus, that is to say, if the staff inside the room, his clothing may touch the virus, take off in the process of air have higher levels of the virus.So does this suggest something similar in the cluster cases of shulan?These also provide a new way for us to analyze.
Bai yansong: there is a folk belief that the case in shulan has now been identified as a laundryman from the public security bureau. From April 8 to 30, the public security bureau involved picking up people (from Russia). Is it possible that the laundryman was infected in the process of making and picking up the clothes of the public security bureau?
Wu zunyou: it’s possible.
Confirmed cases from jilin to shenyang suggest:
Take protective measures when using a closed vehicle
Wu zunyou: when we travel, we are likely to encounter infected patients, or patients in the incubation period. It also reminds us that we should stick to the protective measures in the closed traffic environment.For such a case, there will be many infected people along the way. It is also very difficult for us to fully investigate close contacts. There may be missing close contacts.
Regular epidemic prevention does not mean the epidemic is over
Routine precautions must be taken
Wu zunyou: people may have a different understanding of normalization. Many people understand that normalization is the end of the epidemic.Is it possible to go back to the way we were before the covid-19 outbreak?Not really.The so-called norm, is in the case of us to take protective measures, can return to normal life, work, basically in normal circumstances, or in accordance with the requirements of the prevention and control guidelines, in the place where people gather, in the airtight place, will keep on taking protective measures, especially when we are in the process of travel, must pay attention to protection.
The first confirmed case in wuhan’s east west lake community
Come on from march to may why so long?
Bai yansong: wuhan announced a confirmed case of community infection the day before yesterday.But this case, had the symptom in March, afterwards the symptom disappeared, until now attack diagnose, how to analyze the hair history that he has lasted nearly more than two months?
Wu zunyou: we also noticed this patient. In fact, there are more than one such case in wuhan. Some may have a course of 30 days, 40 days or even 50 days.For the recovery of covid-19 patients, it mainly depends on the patient’s immunity and resistance. If the patient has a strong immunity, he can get rid of the virology in a short time. If the patient’s resistance is weak, he cannot get rid of the virus, so the virus may stay in the body for a long time.
This suggests that when people are old and have low immunity, the course of the disease may be long and may be repeated, which is a difference between covid-19 and SARS and other diseases.An analysis of the disease spectrum in different age groups shows that the younger people, especially children, have a higher proportion of asymptomatic infections, while the younger people have milder symptoms, all of which point to the presentation of symptoms and the speed of recovery, both of which are related to immunity.
Wuhan 6 new cases from the same community to give us what reminder?
Wu zunyou: as long as there is no real “zero clearance” in the community, or there is a positive test in the community (there is a risk).Has quite part of test positive, symptoms of asymptomatic infections is very light, he can’t feel, that these are infectious, he infected patients, infected people may appear symptoms, also could not symptoms, whether or not appear symptoms, he still has the risk of transmission to others, the community or to be vigilant, to strengthen prevention.
Nucleic acid testing is mainly carried out in key areas and populations
Everybody doesn’t have to do it
Net friend: the 5 new confirmed cases in wuhan yesterday all came from the changqing street community. Does that mean we need to screen asymptomatic infected people?Is nucleic acid testing needed to screen the entire population for asymptomatic infections?
Wu zunyou: mass screening nucleic acid test is not everyone to do?Actually also unnecessary, basically be in key area, key crowd.As this netizen said just now, such communities still need to conduct large-scale screening. In those communities without cases, it is not necessary to conduct screening for everyone, but to conduct large-scale screening for key positions, key groups and people in key communities.
Confirmed cases of extra-long illness in wuhan suggest the cunning of the covid-19 virus
The way it coexists with humans is impossible to fathom
Wu zunyou: our understanding of the covid-19 virus is still very limited, and this limitation makes it impossible for us to determine, or determine, how it will co-exist with humans in the future.For now, it’s not going to go away as quickly as SARS did, and it’s not clear how long it’s going to co-exist with humans, or whether it’s going to co-exist with us in an epidemic form.On the other hand, the clinical manifestations of covid-19 are also very special. The case of the man in his 80s you mentioned just now also shows its clinical manifestations are very special. All of these are the continuous improvement of our understanding of the covid-19 virus.
Sporadic cases will no longer cause epidemics of a certain scale
Wu zunyou: I don’t think there will be a small peak.After more than three months of efforts to successfully control covid-19, we have achieved, or at least gained, a lot of experience that will prevent the emergence of sporadic cases from causing a pandemic of a certain scale.Because of our surveillance system, as long as cases are detected, checked and tracked in a timely manner, the epidemic can be put out very quickly and there should be no small epidemic peak.
Net friend: weather more and more hot a lot of people mask wear not to do?
Wu zunyou: the issue of masks is really a very complicated and scientific one. In open areas, in families, you can not wear masks.Masks should be worn in public places, especially in confined environments, even when it is hot, and there is no evidence yet that the spread of covid-19 does not occur when the weather is hot.For such data, the weather is not so hot that we can’t wear masks at present. We still need to overcome some difficulties and persist in wearing masks. We can’t remove masks completely before we have definite evidence.
Will the inaccuracy of temperature measuring gun affect the prevention and control effect?
Wu zunyou: we are not the only one who relies on temperature measurement. We also have symptom monitoring. Some patients have fever, some do not have fever at the beginning, and some have cough and fatigue.
Patients with covid-19 are contagious when they do not exhibit clinical symptoms
Protective measures should not be abandoned when people gather
Wu zunyou: what I want to remind you is that covid-19 is highly contagious, especially when the patient has not yet developed clinical symptoms. The virus detoxification rule of the infected person can be contagious one or two days before the patient has clinical symptoms.For all of you, the fight against covid-19 is still going to have to be sustained, and you’re still going to have to wear masks in places where people are gathered, and you’re not going to give up.