Why is formaldehyde added to the flu vaccine?

Formaldehyde should be added to the influenza vaccine to play an inactivating role. Inactivation refers to the method of killing viruses, bacteria, etc., by physical or chemical means, but without damaging their useful antigens in the body. Inactivating the virus will destroy the higher structure of the viral protein, and the protein will no longer have physiological activity, so it will lose the ability to infect, cause disease and reproduce, but the conventional inactivation will not affect the primary structure of the viral protein, which means that the sequence of the viral protein has not changed.

The free formaldehyde content in the influenza split vaccine does not exceed 50 micrograms ml, which will not affect the human body.

The flu vaccine is used to prevent epidemics**. Suitable for anyone who may be infected with influenza viruses.

Healthy people, vaccinated once a year before the epidemic season, immunity lasts for a year. Influenza vaccine is one of the main measures to prevent and control influenza. It can reduce the chance of getting the flu or reduce the symptoms of the flu.

Formaldehyde contains an aldehyde group that can be cross-linked with the amino group of the protein, which is used for immobilization in immunohistochemistry

1. All Pharmacopoeia of the People's Republic of China (2010 Edition) stipulates that the free formaldehyde content in influenza split vaccine shall not exceed 50 micrograms ml, which will not affect the human body.

There are three types of influenza vaccines currently in use in China: whole-virus inactivated vaccines.

Split vaccines and subunit vaccines are sold in both domestic and imported products. Each vaccine contains three influenza inactivated viruses or antigenic components: subtype A1, subtype A3 and type B. The immunogenicity and *** of these three vaccines are not much different.

However, it should be noted that the whole virus inactivated vaccine is larger for children, and children under 12 years old are prohibited from receiving this vaccine.

2. Influenza vaccine suitable for the elderly.

Seniors over the age of 60 are at high risk of influenza and are also the key recommended groups for influenza vaccination. Among the influenza vaccines suitable for the elderly, the whole virus vaccine has slightly better protection but slightly greater side effects, and the subunit vaccine has slightly less side effects but slightly weaker protection. The split vaccine takes into account the advantages of both, with good protection and safety, and is currently the most widely used influenza vaccine.

It is best to get the flu vaccine before November, because the winter comes a little later in the south, and the vaccination is generally postponed to January and February of the following year. Determination of the key recommended groups for influenza vaccination The Ministry of Health's "Guiding Opinions on Vaccination against Epidemic Vaccination in China (Trial)" points out that all people who wish to reduce the possibility of getting influenza, have no contraindications to vaccination, and are over 6 months old can receive influenza vaccine.

According to the guidance, the key recommended groups for influenza vaccination are: people over 60 years old; Chronically ill and frail patients; health care facility staff, especially frontline workers; Elementary school students and kindergarten children.

The recommended groups are: staff of nursing homes, elderly care centers, and childcare institutions; Workers in the service industry, especially taxi drivers, drivers and passengers of civil aviation, railway and highway transportation, commercial and tourism services, etc.; People who travel frequently for business or domestically and internationally.

The guidance also identifies that the following groups of people are prohibited from receiving influenza vaccines: those who are allergic to eggs or other components of the vaccine; patients with Guillain-Barré syndrome; Pregnant women within 3 months of pregnancy; Patients with acute febrile illness; Chronic disease flare-ups; People with severe allergies; Children under 12 years of age cannot use the whole virus inactivated vaccine; People who are considered unsuitable by their doctors. Contraindications to influenza vaccination Vaccination should not be given in the following cases:

1) Contraindications clearly listed in the instructions of the vaccine manufacturer;

2) Those who are allergic to eggs or have severe allergies are strictly forbidden to be vaccinated;

3) Vaccination is strictly forbidden for those with acute clinical symptoms, such as fever and acute infection;

4) Caution for advanced cancer patients, cardiopulmonary failure, pregnant women, etc.;

5) People who have suffered from Guillain-Barré syndrome are strictly forbidden to be vaccinated;

6) In addition to the above phenomena, those who are unwell in health and those whose contraindications are not easy to grasp should be used with caution or consult a doctor before vaccination.

It should be noted that it also varies from person to person, such as immunocompromised; Those who have colds, as well as allergies to eggs, and are allergic to any of the ingredients in the vaccine, such as excipients, formaldehyde, Triton X-100, gentamicin sulfate, etc., should not be injected. Before vaccination: The day before the injection, it is best not to eat spicy, seafood and other foods that are easy to "get angry", and avoid overeating.

Go to bed on time, maintain a regular schedule, and take a shower. You should also not do too strenuous sports, such as kicking a ball. Taking antihypertensive medications, insulin injections, etc., will not have much effect on vaccination.

For women, it is best to avoid the menstrual period with the vaccination. At the time of vaccination: avoid excessive mental stress, otherwise the psychological reaction will aggravate the adverse reactions of the body.

If there is pain, rub it gently near the eye of the needle. If you have any unfeeling symptoms, you should inform the staff immediately, and the staff will deal with it on site. In general, mild reactions do not require special treatment.

In addition, the vaccinated person should keep in mind the consultation ** published at the vaccination site so that they can consult if they feel unwell. Post-vaccination: Within 24 hours of injection, some adverse reactions may occur, including local adverse reactions (common pain; occasional redness, swelling, itching), systemic adverse reactions (fever, fatigue, headache, dizziness, nausea; Occasionally, sore throat, muscle pain, cough, abdominal pain, joint pain, abnormal movement, dry mouth, loss of appetite, diarrhea, allergies, chest tightness).

The above adverse reactions are mainly mild, and the symptoms can be relieved in 1 to 2 days. It should be noted that the vaccinator should keep the vaccination site dry and clean within 24 hours, and it is best not to take a bath; Three days after the injection, don't engage in too strenuous activities, don't stay up late, and make sure to rest. In terms of diet, you should not eat spicy, seafood, etc.; Fever, redness, swelling, and pain at the inoculation site are normal reactions and can be recovered after 24 hours; If redness and swelling occur, cold compress can be applied to the inoculation site, and if induration occurs, warm compress can be applied to the inoculation site.

If there is a serious adverse reaction, you should go to the hospital immediately. In addition, antiviral drugs should not be taken within two weeks.

Vaccines are produced by multiplying pathogenic bacteria or viruses in large quantities, then inactivated or attenuated by purification. Generally, formaldehyde or B (beta)-lactam is used for inactivation, but it should be removed as much as possible in the later stage, and the residue pharmacopoeia has regulations. The formaldehyde process is relatively backward.

Splitting the flu vaccine is better.

The main thing is the role of embalming.

The formaldehyde component in the adhesive will not have much impact on the human body if it reaches the standard, and there is no formaldehyde component in the adhesive at all, which is currently completely impossible to do in terms of domestic furniture technology, a false proposition.

Bonding agent is one of the most important auxiliary materials and is widely used in packaging operations. An adhesive is a cohesive substance that joins two separate materials together with the help of its adhesive properties. There are many types of adhesives.

By application. Adhesives for industrial use.

It is mainly used for color printing and packaging, architectural decoration and wood furniture, so as to achieve the connection and compound of things.

Adhesives for agriculture and forestry.

It is mainly used for slope greening or other soil structure improvement, which can make the soil form an aggregate structure and achieve the effect of moisture preservation. At the same time, it can enhance the permeability of the soil, prevent soil loss caused by surface runoff, improve soil permeability, retain soil and fertilizer, alleviate and regulate soil water evaporation, and make crops grow better.

It's just for antiseptics, so there are strict regulations. Otherwise, if you accidentally exceed the formaldehyde standard, how harmful it is to health.

If you encounter excessive formaldehyde, many floors have adhesives, you can spray Dialine extract, pure Chinese herbal medicine, which has no effect on the floor itself, and there is no secondary pollution. In fact, it is still necessary to prepare.

Formaldehyde plays two roles in clothing:

1. Color fixing, formaldehyde in dyes and additives is to better prevent fading.

2. In the production process of non-iron clothing, additives containing formaldehyde can prevent wrinkles.

Formaldehyde in the process of fabric dyeing and finishing, can achieve the purpose of anti-wrinkle, anti-shrinkage, maintain the durability of printing and dyeing, or improve the touch, etc., the added resin processing agent, due to the free release, and then cause harm to human health.

Formaldehyde is an indispensable raw material for making clothes.

Because this substance can make the quality of the clothes better.

This kind of thing may be very good for color protection.

This is the step that goes through in the production process.

It may be that this process is required at the time of production.

It may be to save their own manufacturing costs.

Convenient, non-iron clothing to be bleached and dyed, non-iron adaptable to men's casual wear, jackets, bright dresses, printed T-shirts, pajama pants.

Different products will have different formulas, and different formulas require different methods of operation. Sometimes formaldehyde is added without dropping. It depends on what you make. The reaction requirements are different and the speed is different, and the products are different.

Antiseptic. It can keep the seafood beautiful on the outside. Fix its protein to prevent seafood from rotting and smelling, and extend the shelf life.