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What diseases can the flu vaccine prevent?

Mar 22, 2025 Source: Cainiu Health
Dr. Ren Yi
Introduction
The influenza vaccine is primarily used to prevent influenza, an acute respiratory infectious disease caused by the influenza virus. The influenza vaccine can prevent seasonal flu, type A flu, type B flu, pneumonia caused by the influenza virus, tracheitis caused by the influenza virus, and other related diseases. The influenza vaccine can only prevent influenza and its associated complications, but has no preventive effect on other respiratory infection symptoms.

Generally, flu vaccines are primarily used to prevent influenza, an acute respiratory infectious disease caused by the influenza virus. Flu vaccines can prevent seasonal flu, influenza A, influenza B, pneumonia caused by the influenza virus, tracheitis caused by the influenza virus, and other diseases. The specific details are as follows:

1. Seasonal Flu

Seasonal flu is an acute respiratory infectious disease caused by the influenza virus, which spreads during specific seasons each year. It is highly contagious and spreads rapidly. Receiving a flu vaccine can effectively reduce the risk of infection with the seasonal flu virus, alleviate the severity of symptoms, and shorten the duration of illness.

2. Influenza A

Influenza A virus is one of the main pathogens of influenza and can spread between birds and humans. The antigen components in the flu vaccine can stimulate the body to produce antibodies against the influenza A virus, thereby preventing the occurrence of influenza A.

3. Influenza B

Influenza B virus mainly spreads through airborne droplets. The symptoms after infection are relatively mild but still contagious. Flu vaccines contain antigen components targeting the influenza B virus and can prevent influenza B and its complications.

4. Pneumonia Caused by Influenza Virus

Flu vaccines can reduce the risk of pneumonia caused by influenza virus infection. Influenza virus infection may lead to severe complications such as pneumonia, and vaccination can effectively prevent the occurrence of these complications.

5. Tracheitis Caused by Influenza Virus

Flu vaccines can also prevent tracheitis caused by influenza virus infection. Tracheitis is one of the common complications of influenza virus infection, and vaccination helps to reduce the occurrence of this complication.

Flu vaccines can only prevent influenza and its related complications, and have no preventive effect on other respiratory infections. Getting a flu vaccine is an effective method for preventing influenza virus infection, but protective measures such as frequent handwashing and wearing a mask are still necessary after vaccination to reduce the risk of infection.

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