What is the typical duration for adverse reactions to the influenza vaccine?

The typical duration for adverse reactions to the influenza vaccine is indeed 1-2 days. Most individuals experience mild side effects, such as soreness at the injection site, low-grade fever, fatigue, or muscle aches, which usually resolve quickly. These reactions are generally a sign that the immune system is responding to the vaccine, indicating that the body is building protection against the influenza virus.

In contrast, while some side effects may linger slightly longer for a few individuals, they are not common. Serious side effects are rare, and the majority of reactions fall into the mild category and dissipate within a day or two. Understanding this timeframe helps reassure patients about the expected outcomes of vaccination and emphasizes that the benefits of vaccination far outweigh these temporary discomforts.