A 4-year-old girl has been experiencing recurrent coughing episodes accompanied by vomiting. After traditional Chinese medicine treatment, she has not fully recovered, and it is suggested to further investigate and consider the administration of the influenza vaccine.

Is it related to the vaccine if a 4.5-year-old child gets frequent colds after receiving the influenza vaccine?

What are the applicability and contraindications of the influenza vaccine?

Does the influenza vaccine take effect immediately after injection, and how can it effectively prevent influenza?

What precautions should be taken after receiving the influenza vaccine, and how to reduce risks?

When receiving the H1N1 flu vaccine during a cold, it is important to observe for reactions, maintain cleanliness and dryness at the injection site, and be aware of who is not suitable for vaccination.