A 8-month-old baby got the MMR vaccine and had recurrent fever up to 40 degrees.

Patient's question:

Onset of high fever: October 15, 2009, afternoon
Laboratory test results: Not tested yet
Previous treatment and effectiveness: My baby is 10 months old. The day before yesterday morning, he received the MMR (measles, mumps, rubella) vaccine at the pediatric department of the hospital. In the afternoon of the same day, he started feeling a bit feverish. Since it was a low-grade fever, we didn’t pay much attention. However, he had a high fever during his nap in the evening (specific temperature not measured), but his mental state was still good. The pediatric department doctor said it was a normal reaction and advised us to give him more fluids. Yesterday, he had a persistent low-grade fever. In the afternoon, his temperature was measured at 37.6°C, and he was given Chai Huang Granules. In the evening, he started having a low-grade fever again, so we gave him You Ka Dan. In the middle of the night, his fever rose close to 40°C, and we gave him another dose of Meilin, which temporarily reduced the fever. This morning, he started having high fever again, with his temperature rising to 40°C in the afternoon. We went to the hospital and used pediatric fever-reducing suppositories. The doctor prescribed Qing Kai Ling and Chai Hu Granules. I’m wondering if this is due to the vaccination. The baby doesn’t show any other symptoms of fever and is in a good mental state. Should he be taking medication? What medicine would be appropriate for his condition?

Doctor's answer:

Your baby has started to show vaccine reactions, which is the correct approach to respond by drinking more water and treating symptoms. However, vaccine reactions are generally characterized by high fever, rarely below 38.5°C. Therefore, considering the progression of the condition, it is now possible to rule out vaccine reactions. It may be that after vaccination, your baby's immunity has increased, leading to exposure to viruses or bacteria. It is recommended that you carefully monitor the situation with medication and, if necessary, receive intravenous treatment. As for Qingkailing and Chaihu Granules, they can be used temporarily to alleviate symptoms.

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