project |
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Name/scientific name |
HEPATITIS A VACCINE
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Self-financed or subsidized by the Hospital Authority |
Hospital Authority Drug Formulary
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Indications |
Hepatitis A
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body system |
Immunization preparations and vaccines
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type |
Vaccines and antisera
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Hepatitis A vaccine is a vaccine that prevents infection with the hepatitis A virus. It contains parts of the virus and prompts the body to produce antibodies to fight the virus. Vaccination with the hepatitis A vaccine can effectively prevent hepatitis A infection, and is especially important for people traveling to areas with a high risk of hepatitis A.
In Hong Kong, hepatitis A vaccine is usually recommended for the following people:
- People who plan to travel to areas with a high risk of hepatitis A
- Food handlers or restaurant workers
- Healthcare workers
- People with chronic liver disease or other health problems
Hepatitis A vaccination is generally safe, with common side effects including mild pain or redness or swelling at the injection site. If you experience any unusual reactions, seek medical attention immediately.
Finally, vaccination is an effective way to prevent hepatitis A infection. Please consult your doctor for more information about hepatitis A vaccination.
How to use: Hepatitis A vaccine is usually given by injection into the muscle of the upper arm. Both adults and children can receive this vaccine. Vaccination is usually recommended 2 to 4 weeks before traveling abroad. No specific food restrictions or activity limitations are required.
Dosage instructions: The standard dose for adults and adolescents is 0.5 ml, and a second dose is usually given 6 to 12 months after the first dose to ensure full protection. For children, the dosage depends on age and weight, and your doctor will provide appropriate dosage recommendations based on individual circumstances. For infants and young children, the second dose is usually given 6 to 18 months after the first dose. If necessary, your doctor may adjust the dose to suit your individual immune needs. You may experience some minor discomfort after vaccination, such as local pain or fever, but in most cases it is mild and disappears on its own within a few days.
You may experience mild discomfort after taking the hepatitis A vaccine, such as redness, swelling, pain, or fever at the injection site. Less common side effects include headache, fatigue, muscle pain, loss of appetite, nausea, diarrhea, or rash. Very rarely, people may experience a severe allergic reaction such as difficulty breathing, swelling of the throat, or redness of the body. If serious side effects occur, seek medical attention immediately. After vaccination, keep observing your physical condition and seek medical attention promptly if you have any abnormal reactions.
Drug contraindications are warnings that a particular drug is not appropriate for certain situations. For the hepatitis B vaccine, contraindications include people who are allergic to any of the ingredients or have had a severe reaction to a previous vaccination. It should be used with caution during pregnancy and the pros and cons should be considered under the guidance of a doctor. Patients with immunosuppressive conditions or who are receiving immunosuppressive therapy may not be suitable for this vaccine. Vaccination should be postponed for people with acute serious illness. If you have had a severe allergic reaction to hepatitis B vaccine, you should avoid getting vaccinated again. Before vaccination, you should inform your doctor of your allergy history, existing medical conditions, pregnancy status, and medications you are taking to ensure safety. In summary, people in the above conditions should avoid receiving hepatitis B vaccine to prevent adverse effects on the body.
Precautions for use: Please make sure to tell your doctor about allergies, pregnancy conditions, or immune system problems before receiving the Hepatitis A vaccine. You may experience mild discomfort after vaccination, such as fever or pain at the injection site, which usually goes away on its own within a few days. If discomfort persists or is severe, seek medical attention immediately.
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Pregnant women should consult their doctor before using hepatitis A vaccine. Generally speaking, vaccines do not cause harm to the fetus, but it is still recommended to avoid vaccination during pregnancy to ensure the health of mother and child. If you have been vaccinated and find out that you are pregnant, you should contact your doctor immediately and follow your doctor's advice for follow-up treatment.
Also, if you are planning to get pregnant or are currently planning to get pregnant, it is recommended to stop vaccination at least one month before conception. This will help avoid any potential risks. At the same time, if you experience any physical discomfort or reaction after vaccination, please inform your doctor immediately so that appropriate measures can be taken.
Overall, the risk of contracting hepatitis A outweighs the potential risks that the vaccine may pose to pregnancy. Therefore, when deciding whether to get vaccinated, you should consider your own health status and risk factors. If you have any questions, it is recommended that you consult a professional doctor.
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