I checked and found that there are many differences between Category B A and Category B B, but the most important point is that Category B A has compulsory measures, such as forced isolation and compulsory treatment, while Category B B has no compulsory measures and everything is voluntary. In other words, the new coronavirus management has basically been relaxed and everyone is free.
Then someone asked, the new coronavirus has become Class B infectious disease , which means that its toxicity and infectivity are gradually weakening. Why can't it be completely eradicated like smallpox virus and leprosy virus?
Let’s talk about the smallpox virus first.
Smallpox virus is a highly infectious virus with a high fatality rate. It was regarded as a demonic existence in ancient times. Patients may develop severe influenza symptoms after infection, such as high fever, extreme fatigue, chills, headache, etc. When the disease occurs, the whole body will be covered with red rash , and then scabs will form. After recovery, permanent scars will be left on the face, commonly known as pockmarks, hence the name smallpox.
Smallpox virus
Smallpox virus is particularly contagious and can be spread through droplets. In the 16th century, the smallpox epidemic was as common as the common cold. With this disease, the virus can still survive even months after the patient dies. Moreover, this virus is the same as the new coronavirus . Regardless of race, status, age, or gender, as long as they are human, they may be infected with smallpox. Once you get sick, your hope of survival is slim. Even if you are lucky enough to survive, there will be serious sequelae. So in ancient times, people talked about things in a colorful way.
Patients who have had smallpox will develop immunity to the smallpox virus after recovery, and will not get smallpox again. It is said that Emperor Kangxi was chosen as the crown prince because he had suffered from smallpox.
Emperor Kangxi
Because the ancients had this understanding, the ancient Chinese method of treating smallpox was variolation, that is, people who had suffered from smallpox were Remove the acne powder or liquid from the skin, dry it in the sun, grind it into powder, and blow it into the nostrils of normal people with a bamboo tube. These people who have been vaccinated only contract mild smallpox, and they will gain immunity after recovery, which can reduce the possibility of illness to a certain extent. However, this method is also dangerous, and some people will be infected with severe smallpox.
Vaccination method
Later, a British doctor Edward Jenner found that none of the female workers or farmers working in the dairy farms had been infected with smallpox. After research, he found that Vaccinium, a virus acquired by cows, could be slightly transmitted to humans. Instead, humans produced antibodies, which could avoid being infected with smallpox. He then began careful research and successfully developed a cowpox vaccine. He selflessly contributed this method. Every child was vaccinated with cowpox vaccine after birth, and smallpox gradually disappeared. Until 1980, World Health Organization officially announced that the smallpox virus had been successfully eliminated, so babies are no longer vaccinated with cowpox vaccine.
How is the leprosy virus eradicated? To be precise, leprosy has not been eradicated. There are occasional cases in some remote areas of the earth, but they are so few that they give the impression that it has been eradicated.
Leprosy is also a severe infectious disease, which is also transmitted through droplets and contact. Leprosy patients will affect their appearance and cause sensory and motor dysfunction. To put it bluntly, they will be ugly, stupid and disabled. If treated properly, it is generally not life-threatening, but it will seriously affect the quality of life. In the past, due to ignorance, fear and discrimination against leprosy, patients were isolated, abandoned and even killed in history. It was considered an incurable "evil disease". People infected with leprosy were isolated in remote villages and left to fend for themselves.Later, in modern society, with the advancement of medicine, leprosy has been preventable and curable. However, there is no effective vaccine for leprosy.
Let’s talk about the new crown. Why can’t the new coronavirus be eradicated like smallpox?? Haven’t we also developed a vaccine?
To answer this question, we must first find out whether the new coronavirus is a cold.
The new coronavirus infection is not a cold, but an inflammation of the lungs caused by the new coronavirus. However, with the past three years of anti-epidemic, the toxicity of the new coronavirus has continued to weaken, new coronavirus pneumonia can be treated, and the new coronavirus has slowly developed into a disease similar to a bad cold, with cold-like symptoms, such as nasal congestion, runny nose, sneezing, fever, sore throat, itchy throat, etc. Therefore, from a medical point of view, the new coronavirus is indeed a flu-like disease. It can be said that the new coronavirus is a super cold.
So, can also cause pneumonia , and it is also coronavirus . Why can SARS be eliminated but not COVID-19?
mainly has the following reasons:
First, the virus characteristics are different. The SARS virus has poor heat resistance. As long as the temperature rises slightly, the virus will lose its ability to spread. The new coronavirus is very adaptable, and high temperatures are not very effective on them, and they will mutate as the environment changes to adapt.
2, the propagation speed is different. The new coronavirus is extremely contagious, much more serious than SARS. The COVID-19 infection is mainly through droplet infection, close contact infection, and even aerosol infection. Even the items that people come into contact with have viruses. It is very difficult to block the infection through isolation. It can be said that it is impossible to prevent it.
Third, the international environment is different. SARS occurred in 2003. At that time, there were fewer international exchanges than now. Coupled with timely control, the living environment of SARS was not as good as it is now. But now, the convenience of transportation, international tourism and the frequency of international trade have greatly accelerated the spread of the new coronavirus. As long as we don’t close the country and other countries don’t control it, the new coronavirus will never disappear.
In addition, there are the following reasons:
First, the strain of the new coronavirus is constantly mutating. So far, 11 mutant strains have been named, such as the typical virus types Alpha, Beta, Delta and Omicron . In the past few years when the new coronavirus has been rampant, the new coronavirus has mutated into tens of thousands. We are most familiar with Delta first, and then Omicron, and we don’t know what it will become in the future. Although most of us have been vaccinated, the mutated strains enter the body. Our body's immune system can only recognize the previous strains and cannot recognize the mutated strains. It cannot provide in-depth protection and it is difficult to eliminate them. The speed of vaccine development is far from keeping up with the mutation speed of the virus. Therefore, even if you get the new coronavirus, you can't guarantee that you won't get it again.
Second, the half-life of the antibodies produced by the vaccine is very short. Whether it is an antibody produced after self-infection or an antibody produced after vaccination, the maintenance time is very short. The half-life of the antibody is about 3 months. That is, after 3 months, the neutralizing antibody level is only half of the original level. Therefore, the risk of reinfection also exists.
For example, there is a vaccine for influenza, but people who have received the influenza vaccine will catch another cold because the antibodies last for a short time. This is the same truth.
On January 18, 2022, at the World Economic Forum video conference, Michael Ryan, head of the World Health Organization’s emergency project, said: People may never be able to eliminate the new coronavirus, and this virus may eventually become part of the ecosystem.
Therefore, it has become a consensus that mankind cannot eliminate the new coronavirus. Humanity will coexist with the new coronavirus, and we will definitely return to normal life.
