Vaccine Info

Audenz Avian Influenza Vaccine

Authored by
Staff
Last reviewed
August 6, 2022
Fact checked by
Robert Carlson, MD
Share

Audenz™ Avian Influenza A(H5N1) Vaccine

Seqirus Inc. Audenz™ (aH5N1c) is a monovalent, adjuvanted, cell-based inactivated influenza (H5N1) vaccine designed to help protect individuals six months of age and older in the event of avian influenza 'bird flu' pandemics. Audenz's initial U.S. FDA Approval was in January 2020, receiving supplemental FDA approval in 2021. The FDA approved Audenz for use in persons at increased risk of exposure to the influenza A virus H5N1 subtype contained in the vaccine.

An alternative to traditional egg-based manufacturing, cell-based manufacturing avoids egg-adapted changes, one source of strain mismatch between the vaccine and circulating pandemic influenza virus. Audenz combines Seqirus' proprietary MF59® adjuvant technology with its cell-based manufacturing platform. Influenza vaccines using the MF59 adjuvant may enhance and broaden the body's immune response by inducing antibodies against mutated virus strains. This adjuvant is an integral part of pandemic preparedness planning. In addition, it reduces the antigen required to produce an immune response, increasing the number of vaccine doses.

The journal Vaccines confirmed on December 11, 2021, four studies (total N = 6,230) assessed the immunogenicity and safety of mammalian cell-based, MF59®-adjuvanted, A/H5N1 vaccine (aH5N1c; AUDENZ) as two doses administered on Days 1 and 22 in children (NCT01776554), adults (NCT01776541; NCT02839330), and older adults (NCT01766921; NCT02839330). Overall, an age-related response was evident, with the highest responses observed in children <3 years old. In children, antibody titers met seroconversion criteria 12 months after vaccination.

This avian influenza vaccine ensures that many people can be vaccinated as quickly as possible, as directed by the U.S. National Influenza Vaccine Modernization Strategy and the American Pandemic Preparedness Plan. Seqirus has a five-year agreement with the Biomedical Advanced Research and Development Authority (BARDA), a division of the Assistant Secretary for Preparedness and Response Office (ASPR) within the U.S. Department of Health and Human Services, to supply products. BARDA would source vaccines from the Seqirus Holly Springs, NC facility in a pandemic. BARDA certified this facility in June 2022.

On March 23, 2022, a peer-reviewed study published by the journal Vaccines reported 'A cell-based process may be better suited for vaccine production during an HPAI pandemic; aH5N1c influenza vaccine (Audenz) elicited high levels of antibodies following two vaccinations administered 21 days apart and met immunogenicity criteria at Day 43 among both younger and older adults with a clinically acceptable safety profile. And the consistency of the three consecutive aH5N1c vaccine lots was demonstrated in a phase 3 study.

On June 2, 2022, the U.S. government confirmed that Seqirus has established and will maintain the required pandemic readiness to deliver 150 million doses of a cell-based pandemic influenza vaccine within six months of an influenza pandemic declaration in the U.S. Access to pre-pandemic vaccines using either cell- or egg-based manufacturing technologies from Seqirus's global production facilities, including Holly Springs, North Carolina; Liverpool, United Kingdom; and Parkville, Australia. In a pandemic in the U.S., BARDA would source vaccines from the Holly Springs facility.

U.S. FDA STN: 125692; BLA Approval; Supplemental Approval Letter: BL125692/18; Package Insert.

New Jersey-based Seqirus is a global leader in influenza prevention and a business of CSL Limited (ASX: CSL). Trademark: 88789443.

Audenz Indication

Audenz is indicated to protect individuals six months of age and older against influenza A(H5N1) in a pandemic. Do not administer AUDENZ to anyone with a history of a severe allergic reaction (e.g., anaphylaxis) to any vaccine component or after a previous dose of an influenza vaccine. 

Audenz Dosage

Audenz is administered as an intramuscular injection. It is given in two doses, .5 ml each, 21 days apart.

Audenz Side Effects

In adults 18 through 64 years of age, the most common (≥ 10%) solicited local and systemic reactions reported in clinical trials were injection site pain (64%), fatigue (25%), and headache (25%). Avoid use if there is any history of a severe allergic reaction (e.g., anaphylaxis) to any vaccine component or after a previous dose of an influenza vaccine.

To report SUSPECTED ADVERSE REACTIONS, contact Seqirus at 18553588966 or VAERS at 18008227967 or www.vaers.hhs.gov

Pandemic Influenza

Pandemic influenza occurs when a new flu virus emerges for which humans have little or no immunity, allowing the virus to spread rapidly from person to person worldwide. For example, influenza A(H5N1) is known as Avian Flu. Avian influenza A viruses usually do not infect people; however, rare cases of human infection have been reported. 

Influenza Risk Assessment Tool

The Influenza Risk Assessment Tool (IRAT) is an evaluation tool conceived by the U.S. CDC used to assess the potential pandemic risk posed by influenza A viruses that are not currently circulating in people. Input is provided by U.S. government animal and human health influenza experts. This summary table for influenza A viruses that have been assessed using IRAT because the viruses serve as a representative of a particular virus subtype or are of unique interest. Information about the IRAT is available at IRAT Questions and Answers.

Avian Influenza and Zoonotic News

Avian influenza and Zoonotic breaking news are updated frequently.

Audenz News For 2020 - 2022

July 29, 2022 - “It is best practice to never touch or handle birds who are deceased or exhibit signs of distress or illness,” said Dr. Sundari Mase, Sonoma County’s health officer. “While severe cases of bird flu are possible in humans, we rarely see symptoms develop beyond those of the common cold.”

July 4, 2022 - USDA's Animal and Plant Health Inspection Service's National Veterinary Services Laboratories concluded that four samples from stranded seals in Maine have tested positive for H5N1 HPAI.

June 2, 2022 - Seqirus announced its facility in Holly Springs, North Carolina, has successfully achieved all criteria required to establish domestic manufacturing capability for cell-based seasonal and pandemic influenza vaccines as outlined by the Biomedical Advanced Research and Development Authority.

May 26, 2022 - The journal Nature published: Why unprecedented bird flu outbreaks sweeping the world are concerning scientists.

May 17, 2022 - The U.S. CDC recently added the Eurasian H5N1 avian flu strain to the list of animal flu viruses with zoonotic potential that it is monitoring. The CDC said it expects H5 candidate vaccine viruses that have already been recommended to be effective against the bird flu/pandemic virus.

April 29, 2022 - A person tested positive for avian influenza A(H5) virus (H5 bird flu) in the U.S., as confirmed by the CDC and reported by the Colorado Department of Public Health and Environment on April 28, 2022. This case occurred in a person who had direct exposure to poultry and was involved in the culling of poultry with presumptive H5N1 bird flu.

April 28, 2022 - The Colorado Department of Public Health and Environment confirmed a test that revealed the presence of the influenza A (H5) virus in a single nasal specimen from a person working on a farm with infected poultry.

April 13, 2022 - The USDA confirmed additional HAPI outbreaks in various U.S. states.

April 3, 2022 - The United States Department of Agriculture's Animal and Plant Health Inspection Service confirmed the presence of HPAI in a commercial pheasant flock in Erath County, Texas, the 24th U.S. state, to confirm a HAPI outbreak in 2022.

March 19, 2022 - Avian influenza cases are expected in the U.S. through Spring 2022.

February 25, 2022 - Seqirus announced the renewal of a five-year agreement with the BARDA, a division of the Office of the Assistant Secretary for Preparedness and Response. This agreement empowers BARDA to request that Seqirus provide influenza vaccines and adjuvants for pre-pandemic stockpiling or manufacture to support rapid response to an influenza pandemic or other public health emergency. Seqirus and BARDA have held similar agreements since 2006.

November 23, 2021 - The FDA has approved a multi-dose vial presentation for AUDENZ to help protect individuals six months of age and older against influenza A(H5N1) in a pandemic.

October 4, 2021 - Seqirus announced that the Biomedical Advanced Research and Development Authority selected Seqirus to develop two influenza A(H2Nx) vaccine candidates for assessment in Phase 1 clinical study to help safeguard communities in the event of an influenza pandemic. The first candidate will utilize cell-based and adjuvanted technologies, building on Seqirus's highly flexible combination platform technology used by AUDENZ.

February 3, 2020 - Seqirus Announces U.S. FDA Approval of Its First-Ever Adjuvanted, Cell-Based Pandemic Influenza A (H5N1) Vaccine.

January 31, 2020 - The FDA approves Seqirus' Biologics License Application for Influenza A (H5N1) Monovalent Vaccine, Adjuvanted effective for use in persons six months of age and older. For use in persons six months through 17 years of age, the FDA has approved the BLA according to the regulations for accelerated approval, 21 CFR 601.41.

Audenz Influenza A(H5N1) Vaccine Clinical Trials

Audenz has been studied in various clinical trials.

Clinical Trials

No clinical trials found