China has found 3 people infected with H7N9 bird flu

On March 31, 2013, the National Health and Family Planning Commission notified that three cases of human infection with H7N9 bird flu were found in Shanghai and Anhui provinces, of which two died.

What is the problem with this virus? The reporter interviewed Guo Chaotan, an expert in influenza research in the province, a provincial expert, and the director of the Institute of Biological Engineering of the Provincial Academy of Medical Sciences. He said: "Don't be afraid. Chicken and duck meat will not be infected with bird flu because it is a disease that spreads through the respiratory tract. As long as chickens and ducks are cooked at high temperatures, they will not be infected."

The reporter also learned from the Department of Health and Disease Control of the Provincial Health Department that a provincial inspection network has been set up in our province. As of yesterday, the H7N9 bird flu virus has not yet been detected.

[authority release]

Three cases of human cases of H7N9 avian influenza were found in China. Yesterday, the National Health and Family Planning Commission issued an official notification: 3 cases of human cases of H7N9 bird flu were found in Shanghai and Anhui provinces.

Lee, a male patient in Shanghai, was 87 years old. He developed symptoms on February 19. On March 4, he was actively rescued and died.

Shanghai patient Wu, male, 27 years old, onset on February 27, died of active death on March 10th.

Hanzhou City, Anhui Province, female patient, 35 years old, on March 9, the current condition is critical, is actively treating in Nanjing, Jiangsu.



The clinical manifestations of the three cases were as follows: early onset of fever, cough and other respiratory infection symptoms, and then developed into severe pneumonia and dyspnea.

On the afternoon of March 29, the Chinese Center for Disease Control and Prevention isolated H7N9 bird flu virus from specimens of related cases.

On March 30, the National Health and Family Planning Commission organized experts to diagnose 3 cases of human cases of H7N9 bird flu infection based on clinical manifestations, laboratory tests, and epidemiological investigations.

At present, no epidemiologic associations have been found among the 3 cases.

After receiving the report, the National Health and Family Planning Commission attached great importance and immediately dispatched an expert team to the local area to guide and assist in full implementation of the clinical rescue and emergency response.

At present, the health departments of Shanghai, Anhui and Jiangsu are continuing to implement emergency treatment measures such as clinical treatment for patients, close contact tracing and medical observation, and epidemic monitoring as required.

Up to now, no abnormalities have been found in 88 close contacts in 3 cases.

The National Health and Family Planning Commission will continue to pay close attention to the progress of the epidemic and take effective measures in accordance with the epidemic situation to effectively protect public health.

[expert interpretation]

This is the first time in the world that the H7N9 strain has been isolated from humans. Although it was a rest day on March 31, Director Guo Chaotan was still very concerned about this strain. So, when the reporter contacted him, he immediately said the virus's "previous life": "This is the first time in the world to isolate this strain from humans, but everyone does not have to panic, according to the flu of our medical institute. Analysis of the viral biological characteristics of genetic information analysis platform, this strain of human transmission in the human body, should not be very strong."

The medical information platform for the analysis of influenza virus's biological characteristics in the Academy of Medical Sciences once provided a reference for health administrative departments to formulate coping strategies in the 2009 pandemic, and calmly responded to the prevalence of the epidemic.

Director Guo Chaotan first popularized the concept of influenza virus for everyone. Every time a flu comes out, everyone will see the two letters H and N. The difference is followed by the numbers. Many people get dizzy with this name: Why is it called the flu virus?

Everyone who sees it is just a name for influenza virus. The full name of influenza is very long. It needs to identify the type, place of discovery, age of discovery, type of virus, etc. Generally, it can be divided into type A, type B, and type C. Influenza A can be divided into many subtypes based on changes in H and N.

The surface structure of influenza A virus, there are two surface glycoproteins, namely H and N, both of which represent hemagglutinin and nerves (http://?bigclassname=%E8%A5%BF%E8%8D%AF %E4%BA%A7%E5%93%81&smallclassname=%E7%A5%9E%E7%BB%8F%E5%86%85%E7%A7%A)91)The two glycoproteins are very lively, Changes often occur. With their changes, the structure of the virus will be different, and the pathogenicity of humans and the speed of spread among people will also be different. The numbers followed by H and N represent the order of discovery, that is, H1N1 was the first to be discovered. And so on.

According to Director Guo, the H7N9 strain has existed for a long time. In the global gene pool, 20 such viruses have been registered. However, these viruses are all isolated from animals. In the large family of influenza viruses, this strain is a small member.

“Before this virus was never isolated from humans. This time, China has isolated three strains from humans. It is the first time in the world and it is a cross-species transmission, so everyone pays special attention.” The director said.

There is no direct relationship between bird flu and poultry meat. In addition to the nomenclature of H and N, most people hear the sayings of bird flu and swine flu. Many people hear such names and immediately think of them as birds. And pigs are not safe.

Director Guo heard such doubts and shook his head again and again, saying that this was a big misunderstanding.

The reason why influenza is named after poultry and pigs is because it involves the source of influenza virus.

According to Director Guo, human flu is actually from animals.

The study found that the ultimate host of all influenza is wild birds such as wild ducks.

Through domestic poultry and mammals, the most common carriers for transmission to humans are quails, chickens and pigs. Therefore, many flus are also named after the transmitted animal vectors, namely bird flu and swine flu.

Why is it that flu viruses in animals can be infected? Is it because people ate poultry or pigs?

Director Guo said that this misunderstanding is very large. Because of the relationship between names, many people will have misunderstandings. In particular, this report found that cross-species transmission of bird flu virus, many people have such misunderstandings.

In fact, the reason why the influenza virus in animals spread to humans is closely related to the structure of this influenza virus. However, to explain the process of transmission, it is very professional.

Director Guo introduced that, in layman's terms, both humans and animals have a receptor that can bind to the influenza virus. Different influenza viruses require different receptors. The influenza virus is like a screw and is affected by humans and animals. The body is like a nut, and it takes a successful pairing to get an infection.

When an influenza virus has receptors in both humans and animals, the influenza virus spreads between humans and animals. On the contrary, it can only spread among humans or animals.

So, what kind of virus is infected by animals?

“Everyone should not just look at the word 'fowl' and pay attention to the word 'flu'. 'Bird flu' is also flu. The main route of transmission is the same as other flu viruses. It also spreads through the respiratory tract. It is the same as respiratory diseases," said Director Guo.

【Precaution】

Diligently diligently diligently wash and wash the hands of three cases in Shanghai and Anhui. One of the main points that attracted everyone's attention is: Two people died. Many people think of SARS. Therefore, they are more or less worried if they are infected. H7N9 virus, will not be dead immediately?

"Because it is the first strain isolated from humans, there is no vaccine at this time. If it is infected, what medicine can be effectively treated also requires research. However, everyone does not have to panic. From the current report, this poison is The spread of power between people is not very strong," said Director Guo.

According to the announcement issued by the National Health and Family Planning Commission, 88 cases of close contact among 3 cases showed no abnormalities, indicating that the transmission of this strain is not very widespread.

"A new outbreak of flu virus, we are most concerned about two issues: whether there is a wide range of communication power, whether it has a high lethality." Director Guo said that in 2009 a stream of a widespread transmission, low lethality The virus, the so-called low lethality, is that the virus is not dead. Many people may be transient cold symptoms.

As for the H7N9's lethality, the relevant national authorities are also actively studying the issue. Director Guo suggested that people should not blindly panic because the virus does not seem to be able to spread.

All flu are afraid of high temperatures and are afraid of ultraviolet rays. According to Director Guo, the influenza virus has very weak resistance to high temperatures. If it is heated to 56°C, it will lose its pathogenicity within a few minutes. If it is heated to 100°C, it will be inactivated in 1 minute. Don't worry. In addition to high temperatures, the ultraviolet rays are also very lethal. Influenza viruses can be inactivated by exposure to sunlight for 40 to 48 hours. At the same time, it is also afraid of alkaline environment.

Therefore, for this virus prevention method, Director Guo suggested that we should still be able to do three diligent words, namely, diligently open the windows, diligently ventilate, and wash our hands frequently. We should try our best to avoid people’s crowded places. If you have symptoms of colds, please seek medical attention. .