Does it normal for a child to have fever in the morning and evening after getting the hepatitis B vaccine?

Patient's question:

Got vaccinated, had a high fever at night and took medicine to bring it down, but it came back with a high fever again this morning. Past treatment and effectiveness: Tests, detailed examination results: What kind of assistance is needed: How should it be resolved

Doctor's answer:

1. Parents should not rashly use fever-reducing medication. If a child's temperature is not below 38.5 degrees Celsius, encourage them to drink more fluids. In a well-ventilated room, avoid dressing them in excessive clothing and do not cover them with blankets to induce sweating.
2. If the temperature is below 39 degrees Celsius, the child can take acetaminophen or ibuprofen (ibuprofen is slightly more effective). The interval between taking the same medication should not be less than 4 hours. If a single medication does not effectively reduce the fever, alternate between the two.
3. If the child experiences another high fever seizure or has a history of seizures, and the temperature is below 39 degrees Celsius, seek medical attention promptly to prevent convulsions.