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Seasonal Inactivated Influenza Vaccine

Pfizer · FDA-approved active Biologic

Seasonal Inactivated Influenza Vaccine is a Inactivated vaccine Biologic drug developed by Pfizer. It is currently FDA-approved for Prevention of seasonal influenza in adults and children ≥6 months of age. Also known as: SIIV, FluZone.

The vaccine stimulates the immune system to produce antibodies and cellular immunity against seasonal influenza virus strains.

The vaccine stimulates the immune system to produce antibodies and cellular immunity against seasonal influenza virus strains. Used for Prevention of seasonal influenza in adults and children ≥6 months of age.

At a glance

Generic nameSeasonal Inactivated Influenza Vaccine
Also known asSIIV, FluZone
SponsorPfizer
Drug classInactivated vaccine
ModalityBiologic
Therapeutic areaImmunology
PhaseFDA-approved

Mechanism of action

Seasonal inactivated influenza vaccine contains inactivated (killed) influenza virus particles or viral antigens that trigger both humoral (antibody) and cell-mediated immune responses. Upon vaccination, the immune system recognizes these antigens and develops protective immunity, enabling faster and more effective recognition and neutralization of circulating influenza viruses if exposure occurs.

Approved indications

Common side effects

Key clinical trials

Primary sources

Every claim on this page is sourced from regulatory or scientific primary sources. See our editorial policy for full methodology.

SourceUsed for
ClinicalTrials.govTrial enrolment, design, endpoints, results

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Frequently asked questions about Seasonal Inactivated Influenza Vaccine

What is Seasonal Inactivated Influenza Vaccine?

Seasonal Inactivated Influenza Vaccine is a Inactivated vaccine drug developed by Pfizer, indicated for Prevention of seasonal influenza in adults and children ≥6 months of age.

How does Seasonal Inactivated Influenza Vaccine work?

The vaccine stimulates the immune system to produce antibodies and cellular immunity against seasonal influenza virus strains.

What is Seasonal Inactivated Influenza Vaccine used for?

Seasonal Inactivated Influenza Vaccine is indicated for Prevention of seasonal influenza in adults and children ≥6 months of age.

Who makes Seasonal Inactivated Influenza Vaccine?

Seasonal Inactivated Influenza Vaccine is developed and marketed by Pfizer (see full Pfizer pipeline at /company/pfizer).

Is Seasonal Inactivated Influenza Vaccine also known as anything else?

Seasonal Inactivated Influenza Vaccine is also known as SIIV, FluZone.

What drug class is Seasonal Inactivated Influenza Vaccine in?

Seasonal Inactivated Influenza Vaccine belongs to the Inactivated vaccine class. See all Inactivated vaccine drugs at /class/inactivated-vaccine.

What development phase is Seasonal Inactivated Influenza Vaccine in?

Seasonal Inactivated Influenza Vaccine is FDA-approved (marketed).

What are the side effects of Seasonal Inactivated Influenza Vaccine?

Common side effects of Seasonal Inactivated Influenza Vaccine include Injection site soreness or erythema, Myalgia, Headache, Fatigue, Low-grade fever.

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