Can I get a fever if I get infected with viruses and bacteria? Why do bacterial infections cause fev

It is not necessarily a fever, which is related to the number of bacteria or viruses in the autoimmunity, some people have an upper respiratory tract infection, but it is not serious, and the autoimmunity is relatively strong, there will be no symptoms of fever, and some people will show a high body temperature.

Fever caused by viruses is generally low-grade fever, while fever caused by bacteria is usually high-grade. Routine blood tests show that the leukopenia of viral infections and the significant increase in leukocytes of bacterial infections.

Local symptoms of fever caused by virus** infection: nasal congestion, runny nose, sneezing, dry cough, sore throat; Constitutional symptoms include fever, irritability, headache, malaise, and fatigue. Fever caused by bacterial diseases is more common, and fever caused by viruses is more serious than fever caused by bacteria.

On routine blood tests, the number of white blood cells increases, and the main symptoms are headache, dizziness, nausea, malaise, loss of appetite, drowsiness, and high fever.

Hello, the most accurate way to distinguish between viral infection and bacterial infection is a blood test, after the baby has a fever, you can also observe the baby's mental condition, under normal circumstances, although the baby will have a high fever after being infected by the virus, but the baby's mental condition is very good, but when the bacterial infection, the baby's spirit is relatively poor, and he loves to cry.

When bacteria are infected, the body's immune system has to fight it, and the white blood cells in the blood will accumulate at the infected place and play a phagocytic role through the lesion. In addition to white blood cells phagocytosis of antimicrobial substances, it causes inflammatory mediators in the body. The role of inflammatory mediators is to improve blood circulation at the site of infection, speed up blood circulation, and accelerate the aggregation of white blood cells.

The area of infection and suppuration will be red, swollen, hot, painful, or feverish. If it is systemic, like a cold, it acts on the body's thermoregulatory center because the body mobilizes the immune system. By speeding up blood circulation, it transports macrophages, antibacterial, sterilizing, and phagocytosis bacteria, so it can cause fever.

Because of the baby at this period, his resistance is still very low, so if you say, bacterial infection will also cause him to have a fever, you don't have to worry about it, it's okay.

Because of the body's immune mechanism. Fever occurs because the immune mechanism tells us that bacteria have invaded the brain.

Because these bacteria have disrupted the normal secretion system of the human body. It also affects the normal metabolism of the human body, so it will lead to an imbalance in body temperature.

Some bacterial infections can be transmitted to others, so if it is a fever caused by a bacterial infection, is it contagious?

Bacterial infections are contagious and can cause infections of the respiratory, digestive or urinary tract. Bacterial infections of the respiratory tract are more common than acute upper respiratory tract infections. It mainly causes bacterial pharyngeal-tonsillitis, mostly caused by hemolytic streptococcus, followed by Haemophilus influenzae, Streptococcus pneumoniae, and staphylococcus.

Fever caused by bacterial infection has an acute onset, obvious sore throat, chills, fever, body temperature can reach more than 39 degrees, examination shows obvious pharyngeal congestion, tonsil enlargement, hyperemia, yellow punctate exudate on the surface, submandibular lymphadenopathy swelling and tenderness, and no abnormal signs in the lungs.

Fever caused by a bacterial infection can be transmitted through the air through the patient's breathing. If it is a bacterial infection of the digestive tract, mainly acute gastroenteritis, it can be transmitted through diet, that is, eating with a patient with acute gastroenteritis, it may be transmitted through saliva.

Cold and fever is a disease that people often suffer from, and it is the disease with the highest incidence in our country, after all, 99% of people in our country have experienced a cold or fever, but there are many reasons for cold and fever. The common causes of fever include cold at night, lack of sleep and decreased resistance due to lack of sleep. So, what causes a bacterial infection and fever?

It is very easy to cause fever when the weather is very cold or the patient is hungry, especially in winter, when the weather is dry, the temperature in the air is too low, and there is too little moisture, which also accelerates the spread of bacteria. When a fever is caused by an infection with bacteria, it often carries complications, causing a lesion in one of the organs of the body or regardless of the disease, causing the fever to worsen. Common germs are pneumococcus, glucose coli and epidemics, and people can get a fever at any time due to these germs.

Patients with fever caused by a bacterial infection do not have much error between their body temperature and normal body temperature. Generally, it will be between 30 degrees and 5 to 37 degrees. Of course, this range is not fixed, but most patients are within this range, and individual patients will have different body temperatures due to different constitutions and different length of illness.

Generally speaking, fever caused by respiratory tract infection tends to normalize and can be cured within 1 to 3 days of fever.

After the arrival of the new crown epidemic, "temperature measurement" is an easy way for many people to initially determine whether they are infected with the virus, because fever is a key symptom of various infections.

Most people probably attribute this change to the immune system, thinking that a feeling of fever, chills, or malaise means that the immune system automatically turned on its defenses.

This is not the case, and behind all this is the brain's command. More specifically, the nervous system is constantly "docking" with the immune system, and when it confirms that the body is infected, it coordinates a series of behavioral and physiological changes, including the appearance of symptoms that are not very comfortable with us.

In a study published this week in the top academic journal Nature**, scientists found a special group of brain cells for the first time through experiments on mice: a handful of nerve cells that manipulate a series of symptoms such as fever, chills, and loss of appetite after sensing changes in immune status due to infection.

Professor Catherine Dulac of Harvard University is the corresponding author, and Professor Zhuang Xiaowei, a well-known Chinese scientist, also participated in the study.

This special group of neurons is located in the hypothalamus, a key brain region "famous" for regulating important functions such as body temperature, eating, drinking, and endocrine activity. The researchers first managed to get the lab mice with a fever due to a bacterial infection, then searched their brains for nerve cells that were activated at this time, and finally noticed neurons located in the ventromedial preoptic region (VMPO) of the hypothalamus.

To confirm the function of these cells, the researchers used chemogenetics and optogenetics to precisely control the population of about 1,000 neurons, manipulating them to transmit signals. It was found that VMPO neurons are essential for producing symptoms such as fever. Activating these cells led to increased body temperatures, chills, and decreased appetite – a set of symptoms that are very similar to those that often occur in humans after infection.

In addition, the researchers confirmed that this group of nerve cells projects into 12 brain regions, including some brain regions known to control thirst, pain sensitivity and social interaction, in other words, some other symptoms that are common after infection may also be influenced by this group of nerve cells.

In this article, the researchers go a step further to reveal how these nerve cells sense the body's immune status. They found that these nerve cells had an excellent geographical location: right next to the blood-brain barrier.

The blood-brain barrier separates the brain from circulating blood, meaning that this is where the brain and immune system communicate with each other.

The researchers pointed out that the cells that make up the blood-brain barrier can release immune signals, and the neighboring hypothalamic VMPO neurons are equipped with some receptors to receive immune signals, so the cells of the blood-brain barrier trigger nerve cells that control symptoms such as fever through a mechanism called "paracrine signaling".

It's your immune system fighting the virus.

Generally we know that if we are infected with the virus, we will have a fever later. The main reason is that the virus will invade our body in the future. At this time, some of our body's immune cells will attack it.

If such a tool is used, a part of the immune cells will lose their lives during the attack, and if this inflammation occurs, it will cause a certain fever. In addition, if our body has a self-defense ability, it will put our body in a state of fever and fever.

Viral infections can be transmitted to others, so is a viral infection fever contagious?

Viral fever refers to the febrile reaction of the human body due to viral infection, viral infection depends on the specific situation, in fact, the vast majority of infectious diseases are caused by viral infection, most viral infections may lead to transmission, especially respiratory tract infectious diseases, such as the often said flu, influenza A, influenza B, or now more adenovirus infections are caused by viral infections in the respiratory tract, this disease is transmitted through the respiratory tract, which is more likely to lead to infection More careful.

Other viral infections may also cause fever, such as acute HIV infection or acute hepatitis A infection, acute hepatitis B virus infection and other conditions may cause fever, the above diseases are blood-borne diseases, not through the respiratory tract or contact transmission, mainly through blood-borne contact, because the blood and body fluids contain a large number of viral pathogens, for such patients after infection if contact with their blood and body fluids will also lead to transmission.