What are the causes of fever after receiving influenza A vaccine?

Professor Zhou Xin, director of the First People's Respiratory Department affiliated to Shanghai Jiao Tong University, pointed out that after receiving the influenza A vaccine, you generally have a low-grade fever, and the fever will basically go away within a day or two, so don't take medicine indiscriminately.

The proportion of side effects of influenza A vaccine is very small, and it is mainly related to the individual's constitution. The influenza A vaccine is actually the same as any other type of vaccine, and the common *** of the vaccine is that there will be a slight fever, local pain and other reactions.

Generally speaking, if you have a mild reaction such as a low-grade fever below 38 after vaccination, you only need to drink more water and rest more, and the symptoms will disappear within a day or two, without taking medicine and special treatment. If there is a persistent high fever that does not go away, it may be caused by other physical diseases, do not take fever-reducing drugs and antibiotics, and go to the hospital to find a doctor in time to judge.

In addition, many people think that getting the influenza A vaccine is equivalent to getting a "flu A", so they are worried that the fever after getting the influenza A vaccine is "getting influenza A", and they are worried about whether it will be contagious during the fever. Experts point out that the influenza A vaccine is only a fragment of the virus, and it has been inactivated, and the vaccination process does not infect the human body with the virus, but only allows the body's immune system to produce antibodies to the influenza A virus. Even if there is a side effect such as a fever, it is not contagious.

Influenza A vaccine is the abbreviation of influenza A virus vaccine, which is used to prevent influenza A virus infection. However, due to the fact that there are many types of influenza A viruses, and the influenza A vaccine used on the market is only a vaccine produced by the WHO according to the epidemic trend that may have a relatively high incidence of influenza in the current year, even if you are vaccinated against influenza A, there is no complete guarantee that you will not get influenza A again. If you are exposed to a subtype of influenza A virus other than the vaccine, you can still get influenza A.

Influenza A vaccine is generally given about three months before the epidemic of influenza A, or before weather changes, winter and spring, and is generally vaccinated in autumn to prevent influenza A.

However, if the patient has a cold and fever, he should not be vaccinated against influenza A at this time, which will lead to the aggravation of the condition, and he should wait for the symptoms of cold and fever to completely improve before taking the influenza A vaccine to achieve the purpose of preventing influenza A. During the high incidence season of influenza A, try not to go to crowded places in winter and spring.

This is due to physical reasons, different people's physical conditions are different, some people's bodies are weaker, so they will have a violent reaction, and it may also be caused by illness.

If this vaccine causes fever after vaccination, it is generally considered that the vaccine reaction is considered, and it does not matter if you drink more warm water.

This condition is considered to be caused by an adverse reaction to the vaccine and is normal. If the body temperature does not exceed the degree, you can observe it for two days, or you can use physical cooling methods to wipe the body with warm water, which can play a role in cooling down without taking medication.

If you have a fever after receiving the influenza A vaccine, it must be related to the body's reaction to the vaccine.

If you have a fever after the vaccine, it is because of an immune fever that occurs when the body produces antibodies.

It may be caused by allergies. It is best to check the allergens in time, pay attention to rest, drink plenty of boiled water, eat more fruits and vegetables to supplement vitamins.

Children who develop fever after receiving influenza vaccine are usually caused by adverse reactions to the vaccine. A small number of children may have symptoms of an upper respiratory tract infection caused by bacterial or viral invasion. If you have a low-grade fever, don't take medicine for the time being, drink plenty of water, and wipe your child's forehead, armpits, and groin with warm water to reduce the fever.

If the vaccine causes an adverse reaction, the fever will gradually subside.

Influenza vaccine is a vaccine to prevent influenza and is administered at your own expense. Influenza vaccination is effective in preventing and controlling influenza. The best time to get the flu is at the beginning of flu season.

Therefore, it is generally recommended to get a flu vaccine around October. After receiving the flu vaccine, children may develop a fever.

Usually presents within 24 hours, fever can be caused by vaccination. The principle of reducing fever is to drink plenty of fluids and get plenty of rest. When your baby's body temperature exceeds the degree, give your baby antipyretics.

When the temperature is below degrees, physical cooling is sufficient. Drink plenty of fluids and wipe your forehead, neck, armpits, and groin with a warm towel. If necessary, you can also apply an antipyretic patch.

Fever caused by vaccination may last for 24 to 48 hours.

The first thing to consider is that the adverse reactions after influenza A vaccination can be carried out in an appropriate way according to the specific body temperature of the patient**. If the body temperature does not exceed a degree, physical cooling can be used. If the degree is exceeded, antipyretics can be used** and it will return to normal in about a few days.

Secondly, if the fever does not improve, accompanied by symptoms such as cough, cough, nasal congestion, runny nose, etc., it may also be caused by respiratory tract infection or other diseases, and it is necessary to closely observe and go to the hospital in time if necessary.

Fever can occur after receiving the flu vaccine. If it is clear that the fever is caused by the flu vaccine, there is usually no cause for concern, as this is a normal adverse reaction to the vaccine. At this time, drink more warm water, cooperate with physical cooling, and promote excretion and heat dissipation.

For example, use an antipyretic patch, or prepare ice cubes, wrap them in a dry towel and apply them to the patient's forehead. You can also wipe the root of the thighs, armpits, soles of the feet, palms and other parts with warm water, which have a certain cooling effect. If the fever is caused by a cold, you need to take anti-cold medication and keep warm at the same time.

This is because the antibodies in the body of the influenza A vaccine cause the baby to be intolerant, so it is easy to cause fever or vomiting, and you need to go to the hospital for medical treatment.

Because this vaccine is made with an attenuated virus, it is still a virus in nature, and people with poor constitution may develop a fever.

It is a normal reaction to the vaccine, and symptoms similar to a cold can also occur, you can take oral antipyretic drugs under the guidance of a doctor, or you can do physical cooling to reduce fever, you can choose oral antipyretics according to the height of body temperature, and physical cooling can use warm water scrub baths, or topical antipyretic patches.

It is very likely that this vaccine has a reaction in the body, so there will be some fever symptoms, and you can drink more hot water.

Fever after influenza A vaccination is caused by an increase in body temperature to fight the virus.

Hello, this is a vaccine reaction, it doesn't matter, pay attention to drink more water, don't catch a cold, the general vaccine reaction, the second or third day will go down.

In this case, it is likely that the immune system in the body is too strong, or it may be the discomfort caused by the vaccine, or it may be that there is inflammation in the body.

It is very likely that it is caused by the vaccine, and the body has a rejection reaction.

It is normal to have a fever after receiving the influenza A vaccine, because the vaccine is alive, and it will produce an immune fever after it is in the body.

This is normal because the vaccine will inevitably have some discomfort after entering the body, but this will not last long.

It may be a vaccine reaction, in which the human body produces antibodies during the rejection of foreign body vaccines, and the rejection of individual constitutions is more intense, resulting in fever and local inflammatory reactions.

It may be because you are infected, and you do not have a taboo after vaccination, and the symptoms of high fever will occur.

I think it's because everyone's immunity is different, and fever is a sign that the body is producing antibodies.

If you have a fever after vaccination, it may be caused by the vaccine, which is a normal phenomenon, just drink a little more water and pay attention to rest.

According to reports, in the phase III clinical trial of influenza A (H1N1) vaccine, China has observed the effect of more than 10,000 people for 21 days, and the results show that the domestic vaccine is safe and effective. There are also some adverse reactions, mainly local and systemic. The former is local pain, redness and swelling, etc.

The latter are fever, fatigue, headache, dizziness, and nausea common; Occasionally, sore throat, muscle pain, cough, abdominal pain, joint pain, abnormal activity (decreased and increased activity), dry mouth, loss of appetite, diarrhea, allergies, and chest tightness may occur. The above adverse reactions are mainly mild, mainly occurring within 24 hours after vaccination, and can generally be relieved within 1-2 days. Up to now, more than 150 cases of suspected abnormal reactions have been reported in the vaccinated population, but most of them are mild, and no serious adverse reactions have been reported.

Experts remind that people with contraindications cannot be vaccinated; Vaccinated people should be observed at the vaccination site for 15 to 30 minutes after vaccination; Keep the inoculation site dry and clean for 24 hours, and try not to shower; If there is redness, pain or low-grade fever at the vaccination site after vaccination, if it does not disappear naturally for 24 hours, you should seek medical attention in time.

China is the first country in the world to complete the development and registration of vaccines. Prior to the rollout of the influenza A vaccine, 13,000 volunteers were tested for safety, and the results showed that the influenza A vaccine*** was rare and mild. Vaccination is one of the effective means of preventing the epidemic of influenza A (H1N1).

According to the World Health Organization, everyone should be vaccinated against influenza A (H1N1).

What are the influenza A vaccines***?

The common adverse reactions are mainly local pain, redness and swelling, and the systemic adverse reactions are mild fever, headache, etc., which are basically the same as the seasonal influenza vaccine, and no rare adverse reactions have been found. Systemic adverse reactions include: fever, fatigue, headache, dizziness, and nausea are common; Occasionally, sore throat, muscle pain, cough, abdominal pain, joint pain, abnormal activity (decreased and increased activity), dry mouth, loss of appetite, diarrhea, allergies, and chest tightness occur mainly within 24 hours of vaccination.

Who should not be vaccinated against influenza A?

Those who are allergic to eggs or any other ingredient in the vaccine (including excipients, formaldehyde, lysate, etc.), especially ovalbumin; Those suffering from acute diseases, severe chronic diseases, acute onset of chronic diseases, colds and fevers; patients with Guillain-Barré syndrome; Those with uncontrolled epilepsy and other progressive neurological diseases; Those with severe allergies, allergic to gentamicin sulfate; Those who are less than 3 years old; Other people who are not considered suitable for vaccination.

The common adverse reactions after influenza A vaccine injection are mainly:

Local reactions: common pain; Occasionally, redness, swelling, and itching are seen.

Systemic reactions: fever, fatigue, headache, dizziness, nausea are common; Occasionally, sore throat, muscle pain, cough, abdominal pain, joint pain, dry mouth, loss of appetite, diarrhea, allergies, chest tightness, etc.

The above adverse reactions are mainly mild, mainly occurring within 24 hours after vaccination. All of them are normal immune reactions, and no rare adverse reactions have been found, so it is safe to receive influenza A vaccine.