Question
Why do children experience high fever that does not subside after receiving the hepatitis B vaccine? On the third day after vaccination, the child developed symptoms such as June cough, dry heaves, tears, persistent low fever, and coma. What previous rescue measures have been taken and what was their effectiveness? What kind of assistance is needed now? Why does this situation occur?
Answer
Most children will not have or will only have mild reactions after vaccination. A small number of children may experience minor adverse reactions, including local and systemic reactions. Local reactions typically manifest as redness, swelling, heat, pain, or regional lymph node enlargement at the injection site. Systemic reactions include chills, fever, headache, loss of appetite, dry heaves, and abdominal pain. These conditions generally do not require special treatment; simply ensuring the child drinks plenty of fluids and gets adequate rest will usually resolve these reactions within 1 to 2 days. Abnormal reactions may occur simultaneously with or after the general reactions and affect only a very few people. These abnormal reactions may include the following three types: 1) vascular neurogenic edema and anaphylactic shock; 2) neurologic allergic reaction; 3) fainting due to vaccination. Although the incidence of these reactions is low, parents should still be vigilant about their child’s level of stress or allergic constitution. If fainting or anaphylactic shock occurs, the child should be placed in a flat position and given warm water to drink.