Is it normal to have a fever of 38°C after receiving the measles, mumps, and rubella (MMR) vaccine?

Fever generally refers to an elevated body temperature. Whether a fever of 38°C after receiving the measles, mumps, and rubella (MMR) vaccine is normal depends on the specific circumstances. If it is due to vaccine side effects, it is usually considered normal; however, if there is a bacterial infection at the injection site, it is generally abnormal. The details are as follows:

1. Normal

The primary purpose of the MMR vaccine is to prevent measles, mumps, and rubella. Vaccination stimulates the body to produce antibodies, and during this process, body temperature may rise. This is a normal physiological response. Patients typically do not experience pain, redness, or swelling at the injection site, and symptoms usually resolve spontaneously over time. Maintaining healthy daily habits is sufficient.

2. Abnormal

If proper post-vaccination care is not maintained and the injection site becomes infected, body temperature may exceed the normal range and could continue to rise. In some cases, patients may also develop pus at the vaccination site. Active treatment is necessary to prevent worsening symptoms. If adverse reactions are severe, patients should seek medical care at a正规 hospital.

After receiving the MMR vaccine, it is important to maintain healthy lifestyle habits and avoid strenuous exercise to prevent interference with the vaccine's effectiveness. If adverse reactions are severe, prompt medical attention at a正规 hospital is required.