How long does influenza IgM positive last?

Written by Yuan Qing

Pulmonology

Updated on May 16, 2025

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Influenza IgM actually refers to a globulin released by our immune system after influenza enters our body and is recognized by the immune system. This globulin encapsulates or localizes the virus, aiding the phagocytic cells in our body to kill it. This is called IgM. IgM indicates the presence of the influenza virus and a recent invasion into the human body. It is a marker in body fluids and generally persists for about 14-20 days after infection. It does not provide long-term protection to our body and is merely a marker for the acute phase, disappearing once the situation stabilizes.

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Written by Li Fang Xiao

Internal Medicine

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How to get a flu vaccine?

Influenza vaccines are mainly produced to prevent epidemic influenza and are currently available in three main types: Type A, B, and C. The target population for influenza vaccine administration primarily includes the elderly, preschool children, and patients with chronic underlying diseases, who are more suitable for vaccination. For children under three years old, the influenza vaccine should be administered twice, as it is administered via muscle injection and cannot be used intravenously. For this age group, the two doses should be spaced at least four weeks apart. For children over three years old and adults, an annual vaccination is sufficient. The optimal time for influenza vaccination is usually in September and October, as influenza tends to outbreak in winter and spring, so vaccinating during these months can greatly prevent influenza.

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Written by Yuan Qing

Pulmonology

50sec

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Can rhinitis be treated with antibiotics?

Influenza can be treated with antibiotics, but there must be appropriate indications and signs for their use. After influenza infection, the human body may experience a decline in immunity due to the virus, especially a decrease in lymphocytes, which makes it particularly susceptible to bacterial infections. These bacteria are likely to cause bacterial inflammation, with the main symptoms being cough, coughing up yellow phlegm, or having a runny nose with yellow nasal discharge. If such yellow or purulent secretions are observed, they generally indicate a bacterial infection, and it is advisable to boldly use some antibiotics for treatment. Antibiotics that are less toxic, have fewer side effects, and have strong antimicrobial activity should be chosen; such antibiotics often yield very satisfactory results.

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Written by Yuan Qing

Pulmonology

57sec

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What department should I go to for the flu?

Influenza refers to a disease that manifests as cough, fever, and sore throat following human infection by the influenza virus. It is commonly known as the flu or influenza. In addition to respiratory symptoms, the flu may also present with digestive symptoms such as nausea, vomiting, abdominal pain, and diarrhea. Therefore, for flu treatment, one can visit the respiratory department. Of course, in cases of severe symptoms such as high fever, chest tightness, and fatigue, one may also visit the emergency department. However, if the initial diagnosis is predominantly digestive symptoms, it's possible that the gastroenterology department will refer the patient back to the respiratory department for treatment. This requires careful differentiation and exclusion by the doctor before making a diagnosis, so visiting the respiratory or emergency department for flu is appropriate.

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Written by Yuan Qing

Pulmonology

50sec

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Do you need to isolate for the flu?

Influenza can be classified into three types based on the surface membrane proteins and nucleocapsids: type A, type B, and type C. Type A influenza usually causes major outbreaks in populations. Due to frequent genotypic changes in type A influenza, the general population often lacks immunity against it. Generally, influenza is a legally designated class B infectious disease in the country, and it can be transmitted to normal or healthy individuals through droplets, sneezing, or aerosols. Therefore, if an outbreak occurs, isolation measures should be taken, people should avoid crowded public places as much as possible, and maintain ventilation by keeping windows open, to prevent transmission from infected patients or certain animals.

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Written by Yuan Qing

Pulmonology

51sec

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What foods to eat for the flu

Influenza, also known as the flu, is primarily caused by the invasion of the respiratory tract by the influenza virus, resulting in symptoms such as cough, sore throat, and fever. In traditional Chinese medicine, influenza is categorized as wind-heat lung heat disease or phlegm-heat obstructing the lungs syndrome. It is generally recommended that patients with the flu should consume light, heat-clearing, fire-reducing, and anti-inflammatory foods. It is best to avoid overly oily, salty, or sweet foods. Additionally, consuming foods primarily made from ingredients like dandelion, Andrographis paniculata, and wild chrysanthemum can clear heat, detoxify, reduce inflammation, and have antibacterial effects, providing some supportive benefits for flu treatment.