As the chilly embrace of winter descends upon us, it's time to delve into the world of influenza and its vaccine. In this article, we'll explore some common questions and misconceptions surrounding the flu shot, offering a fresh perspective on this annual health ritual.
The Flu's Impact
The flu, often dismissed as a mild illness, can have serious consequences. It weakens the lungs' natural defenses, paving the way for bacterial or fungal infections and secondary pneumonia. But that's not all. Influenza has been linked to cardiovascular issues like heart attacks and strokes, especially in young children who may experience febrile seizures. In rare cases, the flu virus can directly attack organs beyond the lungs, leading to devastating conditions like encephalitis and myocarditis.
What many don't realize is that the flu can be particularly dangerous for the elderly and young infants, who may struggle to cope with the stress of infection. In 2025, Australia saw an estimated 1,744 flu-related deaths, highlighting the need for effective prevention measures.
Protecting Our Children
Flu cases in children are a significant concern. In 2025, nearly two in five diagnosed flu cases in Australia were in individuals under 18. This has led to thousands of hospitalizations each year, with over half of these cases occurring in otherwise healthy children. A study revealed that flu was directly responsible for at least 29 children's deaths in Australia between 2018 and 2023, with many of these children being healthy prior to contracting the virus.
The flu vaccine, with an effectiveness of about 65%, is highly recommended for all Australian children from six months of age onwards. It's a small price to pay for potentially avoiding a serious infection or its complications.
Dispelling the Myth: Flu Vaccine and Flu
One common misconception is that the flu vaccine can give you the flu. However, this is not the case. There are two types of flu vaccines: injectable and nasal spray.
Injectable flu vaccines contain purified haemagglutinin, a protein from the flu virus, which primes the immune system to recognize and fight the virus in the future. While some may experience side effects like fatigue, headaches, and muscle pain, these are not the flu but rather the body's response to the vaccine.
The nasal spray vaccine, FluMist, contains a weakened live form of the flu strain that replicates only in the nose. While it may cause a runny nose or fever in some children, it cannot lead to a serious lung infection or the complications associated with a regular flu infection.
Immune System Overload: Fact or Fiction?
The idea that flu vaccines can overwhelm the immune system is a myth. Our immune system encounters hundreds of antigens daily, from food to our skin and gut, and through natural infections. A small dose of antigens in a flu vaccine is not enough to overload it.
In fact, combining vaccines is a common and safe practice. Our national childhood immunization schedule often recommends administering two to four vaccines at once, and adults are encouraged to get their flu vaccine alongside COVID boosters or the RSV vaccine. There's no evidence to suggest that this overloads the immune system.
Flu Vaccine and Pregnancy
Pregnant women and their unborn babies are at high risk of flu complications. Fortunately, flu vaccines are safe and recommended during pregnancy. A systematic review of 40 studies found no link between injectable flu vaccines and birth defects or stillbirth. Instead, these vaccines were associated with lower rates of preterm birth and low birth weight.
The antibodies from the vaccine transfer from the mother to the baby via the placenta, providing protection against infection for the newborn. So, a flu vaccine during pregnancy offers a triple benefit: protecting the mother, the unborn infant, and the newborn baby.
In conclusion, the flu vaccine is a safe and effective way to protect ourselves and our communities from the potentially devastating effects of influenza. As we navigate the winter months, let's embrace the power of vaccination and dispel the myths surrounding this life-saving practice.
