The reason for writing this article is that a public health professional has recently criticized the government’s policy of intensive measles immunization. The main argument is that most children have already received a booster immunization against measles and most have developed antibodies, and that it is inhumane and unethical to give these children another vaccination for the sake of the few who may have missed it. It also implies that there are risks associated with multiple measles vaccinations, but at the same time expresses confidence that the measles vaccine is safe. Before commenting on this person’s opinion, Li Changqing of the Department of Gastroenterology at Qilu Hospital of Shandong University introduces a farming tool: a sieve. The purpose of a sieve is to remove very small grains of sand and dust from grain. To achieve this, the diameter of the sieve hole is smaller than the grain and larger than the dust. The benefits of using a sieve are obvious, if the manual grain by grain to find the grain of sand and dust is obviously impossible task. Similar to the sieve, there are combs, brooms, rakes, etc.. Not only tools, but also some human activities are similar to sieves, such as roll call, waiting, auditing, production, and so on, as well as medical activities. A major common feature of these human tools and behaviors is excess. With a sieve, one is bound to sift out some grain particles of relatively small diameter, and with a comb one might comb out a few hairs. Isn’t the roll call, which names everyone, wronging those who are not late? Is it a waste of time to wait for the train to arrive early? Is auditing most of the labor useless? Are factories producing as much as the market needs? Inside medical activities, there are many similar excesses. Even without major examinations, with the most common questioning and checking, most conversations and checking are worthless. Most women who are nauseous and vomiting are not actually pregnant, but are asked about their menstrual history. Every malignant tumor that is cut out carries a bit of normal tissue around it so that it doesn’t get cut cleanly. Even the medications used by patients almost always have an overdose, probably a little higher for each person than the minimum dose needed to treat their disease, although this overdose is within the safe range. Appropriate excess is a common human practice for efficiency and risk reduction, and medical activities are no exception. Public health, in turn, is the quintessential expression of appropriate excess in medical activity. Few infectious diseases will cause the extinction of an entire society, and even the most powerful infections will have people who can survive. But vaccinating everyone for the overall safety of the social population is the equivalent of building dikes before the flood comes. Such an activity is obviously impossible for an individual to accomplish and requires the cooperation of the entire society plus the government. Vaccination in almost any country and government is compulsory at the government’s urging, and it is even a basic obligation of citizens to receive vaccinations. Much of modern medicine’s success in increasing the average human lifespan over the past hundred years has come from advances in public health. It has contributed more than surgery or organ transplants. Advances in medicine are really the elimination of old excesses, and the birth of new ones. When smallpox was eradicated in nature, vaccination against it was naturally eliminated. If measles were ever eradicated as well, vaccination against measles would also be eliminated. In the meantime, there may be new vaccinations needed for new infectious diseases. Because of the nature of public health, whether vaccines are promoted, boosted, or eliminated, they must be implemented under unified leadership. Unlike professional guidelines developed by professional societies, public health superior directives also have the nature of administrative orders, which are mandatory and leave no room for bargaining. Specialists who disagree with a professional guideline or textbook should provide appropriate evidence against it, write a professional paper that is peer-reviewed and duplicated by other professionals, and then may make changes in the next guideline update. Until then, it must not be disseminated like the public. As is the case with relatively flexible professional societies, the public health field must be even stricter, and public health professionals should be even more careful about speaking in the face of the public. Even if the public health regulatory system does not allow practitioners to speak freely, there are organizations such as the Society for Preventive Medicine and various medical journal outlets. Until there is general support within the profession and administrative permission is obtained, instructions to superiors should still be carried out according to regulations. Otherwise it is not necessary for everyone to be as individualistic as this person, there is one in every department in every region, and China’s public health system is facing collapse. Also solemnly remind this so-called professional that, as a member of the public health profession, any words or actions that contradict the higher authorities may have serious consequences. As a professional, one should not be unaware of some of the rumors about measles and the serious consequences it has caused. Rumors in Nigeria that measles was a Western conspiracy caused a rapid increase in the incidence of measles in that country; papers published in the UK on the link between measles vaccine and autism caused many Britons to refuse measles vaccinations, leading to a spike in measles cases in 2007. I don’t want to see a situation in the future where young parents in China refuse to vaccinate their children on the grounds that “there is a prevention station where people themselves don’t want to vaccinate their children, saying it’s not effective and there are risks” and that “the Ministry of Health’s requirement to vaccinate the nation’s children is forced by WHO, not It is really for the good of the children” ……