Influenza (seasonal flu) is a respiratory infection caused by influenza viruses. The primary causative agents are influenza A(H3N2), influenza A(H1N1), and influenza B strains. The disease typically manifests as fever, headache, muscle pain, fatigue, runny nose, sore throat, and cough. While the illness is generally mild and resolves within 2-7 days, it can progress to severe forms in children, the elderly, individuals with chronic conditions, immunocompromised patients, and pregnant women, potentially leading to serious complications or death. According to WHO statistics, approximately 5-10% of adults and 20-30% of children worldwide are infected with influenza annually, resulting in approximately half a million deaths due to influenza-related health issues. In Vietnam, approximately 1 to 1.8 million cases of seasonal influenza are recorded each year. The most effective way to reduce the risk of influenza and its potential serious complications is annual vaccination. The quadrivalent Vaxigrip Tetra influenza vaccine is now available at the Hanoi Medical University Vaccination Clinic.
1. Origin
Sanofi Pasteur (France)
2. Indications
The vaccine is indicated for the prevention of seasonal influenza caused by two influenza A strains (H1N1, H3N2) and two influenza B strains (Victoria and Yamagata) in children from 6 months of age and adults.
3. Route of Administration
Route: Intramuscular injection
4. Vaccination Schedule
Children from 6 months to under 9 years of age who have never received an influenza vaccine:
- Administer 2 primary doses at least 1 month apart.
- Follow with 1 annual booster dose.
Children over 9 years of age and adults:
- Administer 1 primary dose.
- Follow with 1 annual booster dose.
- Postpone vaccination for individuals with acute illnesses or active infectious diseases.
- Individuals with hypersensitivity to any vaccine components.
- Hypersensitivity to active substances, any excipients listed in the "composition" section, or any trace residues such as egg (ovalbumin, chicken protein), neomycin, formaldehyde, and octoxynol-9.
- Local reactions: redness, swelling, and pain at the injection site.
- Systemic reactions: mild fever, chills, headache, fatigue, nausea, etc.
Pregnant women:
- Inactivated influenza vaccine can be administered at any stage of pregnancy.
Breastfeeding women:
- Vaxigrip Tetra vaccine can be administered to breastfeeding women.
- Store at temperatures between 2°C and 8°C (in a refrigerator), do not freeze, and protect from light.
- 12 months from the date of manufacture
For further information, please contact:
Safe - Attentive - Reliable 
Facility 1: No. 1 Ton That Tung, Dong Da District, Hanoi.Facility 2: No. 35 Le Van Thiem, Thanh Xuan District, Hanoi.
Working hours: Monday to Sunday morning
Hotline: 02462597231 / 0868098399