Can you Develop Flu Like Symptoms After a Flu Shot?

Short answer is yes.

Here are some of the the reasons.

  1. Flu virus vaccine is not 100% effective. It usually is about 60% effective.
  2. Immune system usually takes about two weeks to start defending. Exposure to virus during this phase can make you sick.
  3. Vaccine tends to work less well in elderly due to less efficient immune system.
  4. One could exposed to a strain that is not covered by the vaccine.
  5. A person can get exposed to other viruses that can cause flu like symptoms e.g. Adenovirus, Parainfluenza, Respiratory Syncytial Virus.

 

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