Many individuals, particularly older adults and those within at-risk groups, receive an annual flu vaccination. However, with a current flu epidemic circulating, some vaccinated individuals are still experiencing symptoms like fever and fatigue. This raises the question: why can someone still get sick after getting a flu shot?
While the influenza vaccine is the best defense against the flu, it isn’t foolproof. The flu virus constantly evolves, and the vaccine’s effectiveness depends on how well the strains included in the vaccine match the circulating viruses. Even when there’s a fine match, the vaccine doesn’t guarantee complete protection, but it significantly reduces the risk of severe illness, hospitalization, and even death.
How the Flu Vaccine Works
The flu vaccine works by preparing your body to defend itself against the influenza virus. When you receive the vaccine, your immune system learns to recognize the virus. This allows your body to mount a quicker and more effective response if you are exposed to the flu, reducing the likelihood of becoming ill. According to the Netherlands’ National Institute for Public Health and the Environment (RIVM), the flu vaccine reduces the chance of getting the flu by approximately 35%. Even if you do contract the flu after vaccination, you are 40% less likely to require hospitalization RIVM.
It’s key to understand that the flu and the common cold are often confused. However, for those in the recommended vaccination group, the flu can have more serious consequences, including long-term health issues, worsening of existing conditions, hospitalization, and, in some cases, even death. Approximately 4,700 people in the Netherlands die from the flu each year RIVM.
Why You Might Still Get Sick
Several factors can contribute to experiencing flu-like symptoms even after vaccination. The flu virus has different types and subtypes, and these constantly change. This means that the vaccine composition is updated annually to target the strains predicted to be most prevalent. If the circulating strains differ significantly from those included in the vaccine, its effectiveness can be reduced.
even with a good vaccine match, individual immune responses vary. Factors like age, overall health, and previous exposure to flu viruses can influence how well the vaccine works for a particular person. It’s also possible to be exposed to a different strain of the flu virus not covered by the vaccine.
Symptoms of the Flu
The symptoms of the flu typically include fever, chills, headache, muscle pain, fatigue, sore throat, and a dry cough mens-en-gezondheid.nl. Symptoms usually appear suddenly and last for one to three weeks. If you are experiencing flu-like symptoms, it’s important to rest, drink plenty of fluids, and consider over-the-counter pain relievers like paracetamol to manage fever and discomfort Thuisarts.nl.
It’s also important to practice good hygiene to prevent the spread of the virus. This includes washing your hands frequently with soap and water, staying home when you are sick, and covering your mouth and nose when coughing or sneezing.
Is the Flu Vaccine Safe?
The flu vaccine is considered a safe and well-established vaccine with few side effects. Millions of people worldwide receive the flu vaccine annually. You cannot get the flu from the flu vaccine itself.
Looking ahead, public health officials will continue to monitor circulating flu strains and adjust vaccine composition accordingly. Ongoing research is also focused on developing more effective and broadly protective flu vaccines. Staying informed about the latest recommendations and practicing preventative measures remain crucial in mitigating the impact of the flu.
Disclaimer: This information is intended for general knowledge and informational purposes only, and does not constitute medical advice. We see essential to consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.
Have you experienced flu symptoms after vaccination? Share your thoughts in the comments below.
