Which of the following symptoms may appear 6-12 hours post-influenza vaccination?

The correct answer is that both malaise and chills may appear 6-12 hours post-influenza vaccination. Post-vaccination symptoms, often referred to as mild side effects, can occur as a natural immune response to the vaccine.

Malaise is a general feeling of discomfort or unease and is commonly reported after vaccinations as the body begins to mount an immune response against the components of the vaccine. Chills can also occur due to the body’s reaction to the vaccine, as it activates the immune system and may cause fluctuations in body temperature.

These side effects typically start to manifest within several hours after receiving the vaccine, which aligns with the given time frame of 6-12 hours. While nausea may occur after vaccination in some individuals, it is less commonly reported compared to malaise and chills as direct responses to the influenza vaccine. Thus, the combination of malaise and chills represents the more commonly experienced symptoms following vaccination within the specified timeframe.