Hepatitis A is the main cause of up to 29% of acute hepatitis cases. Of those, 59% were over the age of 20. The 0.5ml Havax vaccine (Vietnam) is used for people at risk of exposure to the hepatitis A virus.
1. origin
The Havax vaccine is a vaccine against hepatitis A, containing the hepatitis A virus HM175 that is inactivated with formaldehyde and apperated with aluminum hydroxyt.
Havax is researched and manufactured by The No. 1 Vaccine and Biological Products Company Limited (Vabiotech – Vietnam). Havax meets the standards recommended by the World Health Organization WHO.
2. Packing size
- Box of 10 vials, each containing 0.5ml of vaccine.
3. Form of diet
- Injectable flu mix.
4. Specify
Havax is used to prevent hepatitis A for adults and children 2 years and older. Havax is used for people at risk of exposure to hepatitis A virus:
- People who have not been vaccinated with Hepatitis A and plan to travel to epidemic areas (areas where hepatitis A virus is common).
- Exposed occupations: nurses, nurses, public servants working in the care of disabled children, water, wastewater and industrial food treatment workers.
- People who are especially at risk of infection (patients who prefer bleeding, repeated infusions, intravenously, gay).
- Havax does not protect against liver diseases caused by pathogens and other hepatitis viruses.
Dosage and how to take:
dosage:
- Children from 2 years to 18 years old: 0.5ml injection, 2 injections, 2 noses 1 day from 6-12 months.
- Adults 18 years and older: 1ml dose injection, 2 injections, 2 shots 1 shot from 6-12 months.
How to use:
- Not injected intravenously or in the skin, Havax must be intramuscularly injected to get the highest immune response.
- In adults, vaccination into delta muscle area but in children should be injected into the outer thigh area is better because Delta muscles are small.
- The exception can be vaccinated into the subcutaneous area for patients who prefer bleeding.
- Shake the vaccine jar thoroughly before the injection.
5. Contrainatrained
- Do not inject Havax to people who are too sensitive to any component of the vaccine.
- High fever or a full-body reaction to an ongoing infection.
- Heart disease, kidney disease or liver disease.
- Diabetes or malnutrition.
- Blood cancers in particular and malignanc diseases in general.
- Hypersensitivity.
- Intravenously should not be given under any case.
- Do not inject children under 2 years old (24 months old).
- Do not inject subjects with congenital diseases.
- Postponement of injections in people with high fever or a full-body reaction or an ongoing infection.
6. Special warning and caution
- Just like all vaccines: epinephrine should always be available as a precaution against cases of anaphylactic shock after vaccination.
- Havax should not be injected into the buttocks or in the skin because of the low immune response
- For patients who are having blood verification or immuno-deterioration, after injection, the antibody content may not be as high as expected. With these subjects may have to inject additional doses, repeat.
- The incubation period of hepatitis A can be prolonged. Therefore, if vaccination is in the incubation stage, the vaccine may not be able to protect these subjects.
7. Undesirable effects
- Common reactions: After, swelling, redness at the injection site. These symptoms usually clear up within 2 days after injection.
- Rarely encountered: fever, headache, nausea, fatigue, dizziness. However, there is insufficient evidence to prove there is a link between vaccination and these undesirable effects.
8. Shelf life
Shelf Life: 24 months from the date of manufacture.
Special caution when preserving:
- Store in the refrigerator (2°C – 8°C).
- Don't let it get frozen.
- Avoid light
If you have abnormal symptoms, you should be examined and consulted with a specialist.
For direct advice, please click hotline number or register online HERE. In addition, you can register for remote consultation HERE
Source: According to information approved by the Drug Administration of Vietnam on 03/01/2018
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