The flu vaccine: why get It, which type to choose, and what you need to know
February 2025, article by Prof. Guido Castelli Gattinara, infectious disease specialist and pediatrician at Aventino Medical Group. The flu vaccine is one of the best strategies to prevent influenza and its complications. Not only does it protect your health, but it also helps reduce the spread of the virus within the community, safeguarding vulnerable individuals and family members. Discover why it is important, who should get vaccinated, the available types of vaccines, potential complications, and debunk the most common myths. Why is the flu vaccine important? Influenza is not just a simple fever: every year, it causes millions of cases worldwide and can lead to serious, sometimes fatal complications. Here’s why the vaccine is essential:✅ Reduces personal risk of severe illness.✅ Protects vulnerable individuals.✅ Helps prevent complications such as pneumonia or respiratory failure.✅ Contributes to reducing the burden on healthcare systems. How does the vaccine work? The vaccine stimulates the immune system to produce antibodies against the most common influenza strains of the specific season. Although it does not provide total protection, it significantly reduces the severity of the illness and the risk of complications. Who should get the flu vaccine? Priority groups for vaccination: 👶 Children aged 6 months and older (RECOMMENDED)Their immune systems are less developed, making them more susceptible to complications. They also live in close-contact environments, increasing their risk of infection. 👵 Elderly individuals (over 65 years) (RECOMMENDED)With age, the immune system weakens, increasing the risk of severe flu symptoms and complications. 💉 People with chronic conditions (RECOMMENDED)Those with diabetes, cardiovascular diseases, asthma, autoimmune diseases, or other chronic conditions are at higher risk of flu-related complications. 🤰 Pregnant women (RECOMMENDED)The vaccine protects both the mother and the newborn in the first months of life, when the baby’s immune system is still immature. 👨⚕️ Healthcare workers and caregiversSince they are in close contact with vulnerable individuals, getting vaccinated is an act of responsibility to prevent the spread of the virus. Even asymptomatic infections can transmit the virus to patients and family members. 🏢 Workers and studentsCrowded environments, such as schools, offices, and public transportation, increase the risk of transmission. What types of flu vaccines are available? 💉 Inactivated Vaccine (IIV)Contains killed viruses and is administered intramuscularly. Suitable for children aged 6 months and older and adults. ⚡ Adjuvanted Vaccine (aIIV)Includes an adjuvant that enhances the immune response. Recommended for adults over 50 and the elderly. 🔬 Subunit or Split VaccineContains fragments of the virus, reducing the risk of adverse reactions. Suitable for everyone from 6 months of age, including pregnant women, chronic patients, and individuals with weakened immune systems. Certain subunit and fibroblast-cultured vaccines minimize the risk of rare allergic reactions and are recommended for children from 24 months and adults. 👃 Intranasal Vaccine (LAIV)Contains live attenuated viruses and is administered via nasal spray. Recommended for children and adolescents aged 24 months to 18 years (not for pregnant women or individuals with chronic conditions). 🛡️ Quadrivalent VaccineProtects against four influenza strains (two A and two B), identified as the main circulating strains for the season, ensuring broad coverage. Almost all flu vaccines today are quadrivalent. Your doctor will help you choose the most suitable vaccine based on your age and health condition. What are the possible complications of the flu vaccine? The flu vaccine is generally safe, but it may cause side effects, mostly mild: Common effects: Rare effects: ➡️ What to do in case of side effects?For mild symptoms, medications like paracetamol or emollient creams may help (consult a doctor first). In case of severe reactions, contact a doctor immediately. Flu vaccine: myths vs. facts 🔍 “The vaccine gives you the flu.”❌ False. The vaccine contains inactivated (only virus fragments) or attenuated viruses that cannot cause the illness. 🔍 “I never get sick, so I don’t need it.”❌ False. Even those who don’t develop severe symptoms can still carry and transmit the virus to vulnerable individuals. 🔍 “The vaccine isn’t effective, so it’s useless.”❌ False. While it doesn’t guarantee total protection, it significantly reduces symptom severity and the risk of complications. A multidisciplinary approach to vaccination Flu vaccination often involves collaboration between different medical specialties: Frequently asked questions (FAQ) 📌 When should I get the flu vaccine?The ideal time is between October and December, before the peak of flu season. 📌 Who should not get the flu vaccine?People who have had severe allergic reactions to the vaccine or any of its components. 📌 Where can I get vaccinated against the flu?At your primary care physician’s office, authorized pharmacies, or specialized medical centers. 📌 How long does the flu vaccine protection last?The protection lasts approximately 6 to 12 months, which is why annual vaccination is recommended. Conclusion: the flu vaccine is an investment in your health Getting vaccinated against the flu is a smart decision to protect both yourself and the community from seasonal influenza and its complications. Whether you are in a high-risk category or frequently exposed to potential infections, the flu vaccine is a safe and effective option. Staying informed and relying on trustworthy sources is essential for making well-informed health decisions. Talk to your doctor and consider getting vaccinated to face flu season with greater protection.