Influvac Tetra 2026 is a Quadrivalent Inactivated Influenza Vaccine (Surface Antigen) by Abbott India Limited. Unlike trivalent (3-strain) flu vaccines, Influvac Tetra covers 4 influenza strains — two Type A (H1N1 + H3N2) and both Type B lineages (Victoria + Yamagata). This eliminates the B-strain mismatch risk present in trivalent vaccines. Each 0.5 mL dose contains 15 µg Haemagglutinin (HA) per strain, formulated with WHO recommended strains for the 2026 season. Uses surface antigen technology for high purity and excellent tolerability.
🌐 WHO 2026 Recommended Strains — All 4 Included in Influvac Tetra
Type A · H1N1
A/Missouri/11/2025 (H1N1)pdm09-like strain
(A/Switzerland/6849/2025, IVR-278)
15 µg HA per dose
Type A · H3N2
A/Singapore/GP20238/2024 (H3N2)-like strain
(A/Singapore/GP20238/2024, IVR-277)
15 µg HA per dose
Type B · Victoria
B/Austria/1359417/2021-like strain
(B/Austria/1359417/2021, BVR-26)
15 µg HA per dose
Type B · Yamagata ⭐
B/Phuket/3073/2013-like strain
(B/Phuket/3073/2013, wild type)
15 µg HA per dose
⭐ QUADRIVALENT — 4 Strains · Total 60 µg HA per dose* HA = Haemagglutinin · Propagated in fertilized hen's eggs · Inactivated with formaldehyde
⭐ Why Choose Quadrivalent (4-Strain) Over Trivalent (3-Strain)?
✓ Influvac Tetra – Quadrivalent (QIV)
4 Strains · Maximum Coverage
A/Missouri H1N1 – 15 µg HA
A/Singapore H3N2 – 15 µg HA
B/Austria (Victoria lineage) – 15 µg HA
B/Phuket (Yamagata lineage) – 15 µg HA
✓ Covers BOTH B lineages → no B-strain mismatch risk
Trivalent Flu Vaccine (TIV)
3 Strains · Limited Coverage
A/Missouri H1N1 – 15 µg HA
A/Singapore H3N2 – 15 µg HA
B/Austria (Victoria lineage) – 15 µg HA
B/Phuket (Yamagata) – MISSING
✗ If B/Yamagata dominates that season → reduced protection
💡 Why does the B-strain matter? Each flu season, either B/Victoria or B/Yamagata lineage may dominate. Trivalent vaccines include only ONE B lineage — chosen by WHO each year. If the OTHER B lineage circulates, TIV provides poor protection against it. Influvac Tetra covers BOTH, eliminating this gamble entirely. QIV is the WHO-preferred formulation.
👥 Who Should Get Influvac Tetra?
Everyone 6 months and older should get an annual flu vaccine. These groups especially benefit from the broader QIV coverage:
👶
Children Under 5
Young children are at high risk of severe flu. Children under 9 getting flu vaccine for the first time need 2 doses, 4 weeks apart. QIV's 4th strain especially important for children who face both B lineages.
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Adults 65+ Years
Elderly are most vulnerable to flu complications. B/Yamagata causes significant disease in older adults — Influvac Tetra's full 4-strain coverage is particularly valuable for this group.
🤰
Pregnant Women
Recommended in any trimester. Maternal antibodies — including anti-B/Yamagata from QIV — transfer to the newborn. Broader coverage = better protection for both mother and baby.
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Healthcare Workers
Exposed to all circulating strains. QIV ensures complete season coverage without needing to predict which B lineage will dominate. Annual QIV is the standard of care for HCW flu vaccination.
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Chronic Disease Patients
Asthma, COPD, heart disease, diabetes, kidney disease, obesity — all increase risk of life-threatening flu complications. QIV provides the broadest available protection.
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Immunocompromised
HIV, chemotherapy, transplant patients on immunosuppressants. Inactivated QIV vaccines like Influvac Tetra are safe in immunocompromised individuals (no live virus).
✈️
International Travellers
Travel exposes you to different global flu strains. QIV covers the widest range. Book Influvac Tetra at home before travel through VacciHub — same-day bookings available.
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Whole Family
One VacciHub nurse visit — entire family vaccinated at home. Ideal for families with infants, elderly grandparents or immunocompromised members who need maximum flu protection.
🔬 Influvac Tetra Composition – Per 0.5 mL Dose
As per Abbott India manufacturer label. Each 1 × 0.5 mL prefilled syringe contains:
Component
Quantity
Notes
ACTIVE INGREDIENTS – 4 INFLUENZA STRAINS (WHO 2026)
💡 Surface Antigen vs Split Virion: Influvac Tetra uses surface antigen technology — only the key immune-stimulating proteins (Haemagglutinin + Neuraminidase) are extracted and purified, leaving all internal viral components behind. This creates an exceptionally pure, well-tolerated vaccine with strong immune response focused exactly on the antigens that matter.
ℹ️ Egg allergy: Influvac Tetra is propagated in fertilized hen's eggs and may contain trace egg proteins. Persons with mild egg allergy (hives only) can receive it with 30-minute observation. Severe egg allergy (anaphylaxis) → consult doctor first. Our VacciHub nurses conduct a pre-vaccination health check before every dose.
📅 Influvac Tetra 2026 – Vaccination Schedule
Group
Dose
Timing
Notes
Children 6 months – 8 years (1st ever flu vaccine)
2 Doses
Dose 1 + Dose 2, 4 weeks apart
First-time only; 1 dose annually thereafter
Children 6 months – 8 years (previously vaccinated)
1 Dose
Annually before flu season
If ≥2 lifetime flu vaccines received previously
Children 9 years – Adults
1 Dose
Every year
Single annual dose
Pregnant Women
1 Dose
Any trimester · annually
Protects mother + transfers antibodies to newborn
Elderly 65+, High-risk groups
1 Dose
Annually (before monsoon or winter)
Do not delay — vaccinate as soon as QIV available
ℹ️ Best timing in India: Before monsoon (May–June) for July–September protection; before winter (October–November) for December–February season. Getting vaccinated any time is better than not getting vaccinated. Annual re-vaccination with the updated strain formulation is essential.
⚙️ How Does Influvac Tetra Work?
1
Purified Surface Antigens Injected IM
0.5 mL injected intramuscularly (deltoid in adults; anterolateral thigh in children) or deep subcutaneously. The dose delivers highly purified Haemagglutinin (HA) and Neuraminidase (NA) surface proteins from all 4 WHO 2026 influenza strains — no internal viral components, no live virus.
2
4-Strain Immune Recognition
Antigen-presenting cells recognise and process the HA and NA proteins of all 4 strains. T-helper cells are activated and guide both B-cell proliferation (antibody production) and cytotoxic T-cell responses against each strain independently.
3
Strain-Specific Anti-HA Antibodies Generated
High-titre IgG anti-HA antibodies are produced against H1N1, H3N2, B/Victoria and B/Yamagata — all 4 strains. Anti-HA antibodies prevent influenza virus from binding to respiratory epithelium, blocking infection before it can establish.
4
Seasonal Protection in 10–14 Days
Protective antibody levels develop within 10–14 days. Protection wanes within 6–12 months AND new strains emerge — meaning annual vaccination with the updated formulation is the only way to maintain continuous, season-relevant protection.
✅ Cannot cause flu: Influvac Tetra is a completely inactivated (killed), fragmented surface antigen vaccine — no live virus whatsoever. It is impossible to contract influenza from this vaccine. Mild post-vaccination symptoms are the immune system's normal activation response, not flu infection.
⚠️ Influvac Tetra Side Effects
Influvac Tetra is highly purified using surface antigen technology, resulting in excellent tolerability. Most people experience no significant side effects.
🟡 Common (Mild, 1–2 Days)
💉 Injection-site soreness / pain
🔴 Mild redness or swelling at site
🤕 Headache
😴 Fatigue / mild body ache
🌡️ Low-grade fever (<38°C)
🔴 Rare – Seek Medical Attention
🥚 Allergic reaction (egg allergy — rare)
😵 Syncope (fainting) post-injection
⚡ Guillain-Barré Syndrome (GBS) — extremely rare
🚨 Anaphylaxis (extremely rare)
💡 Observe for 15–30 minutes after injection. Apply a cool cloth to the injection site for comfort. Paracetamol for fever/pain per doctor's advice. Our VacciHub nurses monitor all patients post-vaccination before leaving the home visit.
ℹ️ Bottom line: For maximum flu season protection — especially when it is uncertain which B lineage will dominate — Influvac Tetra (QIV) is the superior choice. The additional B/Yamagata strain adds meaningful clinical benefit, particularly for children and elderly.
🚫 Precautions & Contraindications
Do NOT give Influvac Tetra if:
Anaphylaxis to a previous influenza vaccine dose
Known severe hypersensitivity (anaphylaxis) to egg proteins
Acute moderate-to-severe febrile illness — defer until recovery (mild illness is NOT a reason to postpone)
Use with Caution / Discuss with Doctor:
Mild egg allergy (hives only) — can receive with 30-minute post-vaccination observation
History of Guillain-Barré Syndrome within 6 weeks of previous flu vaccine
Immunosuppressed patients — may have reduced response but vaccine still recommended
Thrombocytopenia or anticoagulant therapy — injection-site bleeding risk
⚠️ Storage: Store at 2°C to 8°C. Do NOT freeze. Keep out of reach of children. VacciHub nurses carry Influvac Tetra in validated cold boxes at 2–8°C and check temperature compliance before every dose.
🏥 Why Book Influvac Tetra with VacciHub?
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Certified Nursing Staff
Trained, certified nurses for all age groups — infants to elderly. Correct IM or deep SC injection technique. Pre-vaccination health check included.
❄️
Cold Chain Guaranteed
Influvac Tetra transported in validated cold boxes at 2–8°C. Never frozen. Full cold chain compliance from warehouse to your home.
✅
Genuine Abbott India QIV
Sourced exclusively from authorised Abbott India distributors. 2026 season formulation confirmed. Batch and expiry transparent on WhatsApp receipt.
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Whole Family — One Visit
Vaccinate grandparents, parents, children — all in one home visit. No multiple hospital trips. Ideal for families wanting complete QIV coverage.
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Annual Reminder Service
WhatsApp reminder set automatically for next year's flu shot. Never miss a season again.
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Same-Day & Weekend Slots
Flexible bookings morning to evening including weekends. Need flu shots before travel? Same-day available across Delhi NCR.
📍 Influvac Tetra Home Vaccination – Cities We Cover
🏛️Delhi (All Areas)
🏙️Gurgaon
🌆Noida
🏘️Ghaziabad
🏗️Faridabad
🌇Greater Noida
Call +91 92050 04114 to confirm your pincode — same-day slots available.
Influvac Tetra 2026 is an Inactivated Influenza Vaccine (Surface Antigen) Quadrivalent by Abbott India. It covers 4 influenza strains — H1N1, H3N2, and both B lineages (Victoria and Yamagata). Regular trivalent vaccines cover only 3 strains and include just ONE B lineage. If the other B lineage dominates that season, trivalent vaccines provide poor B-strain protection. Influvac Tetra eliminates this risk entirely.
Influvac Tetra 2026 contains: (1) A/Missouri/11/2025 (H1N1)pdm09 · IVR-278 — 15 µg HA; (2) A/Singapore/GP20238/2024 (H3N2) · IVR-277 — 15 µg HA; (3) B/Austria/1359417/2021 (B/Victoria) · BVR-26 — 15 µg HA; (4) B/Phuket/3073/2013 (B/Yamagata, wild type) — 15 µg HA. Total 60 µg HA per 0.5 mL dose. Complies with WHO 2026 Southern Hemisphere recommendation.
Influvac Tetra provides broader protection — it covers 4 strains (QIV) including B/Yamagata, while VaxiFlu covers only 3 strains (TIV, B/Yamagata not included). Influvac Tetra also uses surface antigen technology (more purified) vs VaxiFlu's split virion method. For maximum seasonal protection — especially when B lineage prediction is uncertain — Influvac Tetra (QIV) is the clinically preferred choice.
Yes. As stated on the manufacturer label: "This vaccine complies with the World Health Organization (WHO) recommendation (Southern Hemisphere) and competent authority decision for the 2026 season."
Yes. VacciHub provides home vaccination with genuine Abbott India Influvac Tetra 2026 across Delhi, Gurgaon, Noida, Ghaziabad, Faridabad and Greater Noida. We vaccinate the whole family in one visit. Call +91 92050 04114 or WhatsApp to book.
Yes — inactivated influenza vaccines like Influvac Tetra are safe and recommended in any trimester of pregnancy. QIV provides the additional benefit that maternal anti-B/Yamagata antibodies also transfer to the newborn. VacciHub nurses are trained for pregnancy-safe vaccination.
Surface antigen vaccines (Influvac Tetra) contain only the Haemagglutinin (HA) and Neuraminidase (NA) surface proteins — isolated and purified from the fragmented virus. This creates an exceptionally pure product with fewer non-immunogenic components. Split virion vaccines contain more of the viral particle (including some internal proteins). Both are inactivated and safe; surface antigen vaccines are generally associated with fewer local and systemic reactions.
Influvac Tetra is propagated in fertilized hen's eggs. Persons with mild egg allergy (hives only) can receive it with 30-minute post-vaccination observation. Persons with a history of severe egg anaphylaxis should consult their doctor first. Our nurses conduct a pre-vaccination health screening before every dose.
