The U.S. Food and Drug Administration (FDA) has approved Moderna’s new mRNA-based influenza vaccine, mFlusiva, marking the first influenza vaccine to utilize the same messenger RNA (mRNA) technology that played a pivotal role during the COVID-19 pandemic.
The vaccine is approved for adults 50 years of age and older and represents a significant advancement in vaccine technology that could improve the ability to respond quickly to evolving influenza strains.
What Makes This Flu Vaccine Different?
Traditional flu vaccines are produced using methods that have been in use for decades, often requiring months of manufacturing time. mRNA vaccines work differently by providing instructions that help the body produce proteins that trigger an immune response.
Potential advantages include:
- Faster vaccine development and production
- Greater flexibility when influenza viruses mutate unexpectedly
- Potential for improved effectiveness against circulating strains
- Easier adaptation to emerging influenza threats
How Effective Is It?
According to Moderna, a study involving approximately 40,000 adults aged 50 to 64 found that recipients of mFlusiva experienced 27% fewer cases of influenza compared with recipients of a commonly used flu vaccine. For adults aged 65 and older, approval was granted through an accelerated pathway based on strong immune response data compared with an existing high-dose influenza vaccine. Additional studies are ongoing to further evaluate effectiveness in older adults.
Safety Profile
The vaccine demonstrated a safety profile similar to other mRNA vaccines and influenza vaccines currently in use. Common temporary side effects included:
- Injection site pain
- Fatigue
- Headache
- Muscle aches
- Fever
No major safety concerns were identified during clinical trials.
What Does This Mean for Canadian Travellers?
Although mFlusiva has received FDA approval in the United States, it has not yet been approved by Health Canada. However, this approval signals an important development in influenza prevention and may influence future vaccine options available to Canadians.
For travellers, influenza remains one of the most common vaccine-preventable illnesses encountered during travel. Air travel, cruises, tours, conferences, and crowded tourist destinations increase exposure risks, particularly for:
- Adults over 50
- Seniors
- Individuals with chronic medical conditions
- Immunocompromised travellers
- Cruise passengers
- Group tour participants
Travel Health Considerations
Many travellers focus on exotic diseases such as malaria, yellow fever, or typhoid while overlooking influenza. In reality, seasonal influenza causes significant illness worldwide every year and can disrupt travel plans, lead to hospitalization, and contribute to serious complications, particularly in older adults.
A pre-travel consultation provides an opportunity to:
- Review influenza vaccination status
- Assess individual risk factors
- Discuss destination-specific health concerns
- Ensure routine immunizations are up to date
- Develop strategies to reduce illness while travelling
The Bottom Line
The FDA approval of Moderna’s mRNA flu vaccine represents another milestone in vaccine innovation. While Canadians will need to wait for potential Health Canada review and approval, the development highlights the growing role of mRNA technology beyond COVID-19.
As influenza continues to be a significant global health concern, travellers should ensure they are protected with recommended vaccinations before departure.
Planning International Travel?
At Destinations Travel and Immunization Clinic (DTC), our travel medicine practitioners provide comprehensive travel health assessments, destination-specific vaccine recommendations, and personalized advice to help keep you healthy throughout your journey.
Book your travel consultation early — ideally 6 to 8 weeks before departure — to ensure adequate time for vaccinations and preventive care.
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